初中英语语法知识—介词的分类汇编附答案(1)
初中英语语法知识—介词的分类汇编含答案解析(1)
一、选择题1．It’s very kind ___________ you to lend me your reusable shopping bags.A．of B．for C．to D．with2．The old man arrived _________ the village _______ a rainy night.A．at; on B．on; at C．in; at D．on; in3．North Korea is________Asia. It’s________the nor theast of China and________the west of Japan.A．in, to, on B．in, on, to C．on, in, to D．to, on, in 4．Jiangsu Development Summit was open _____ May 20th in Nanjing.A．on B．in C．at D．by5．If you can’t read the article, it will be meaningless to you. The –less in the word “meaningless” means .A．with B．without C．full of D．out of6．Thanks ______your family photos, they are very nice.A．to B．in C．for D．at7．We have four lessons ________ the morning.A．in B．on C．at D．for8．There is an old bridge __________the river. Be careful (小心) when you ________________ it. A．over; across B．over; cross C．on; cross D．on; across9．My computer game is ______ the drawer and my books are _______ the sofa.A．on; on B．in; in C．on; in D．in; on10．My best friend is now________China, so I want to go________China, too.A．in；on B．on；to C．of；for D．in；to11．There is a computer _______ the desk.A．on B．in C．under D．for12．Which of the following(下面) is right?A．The boy begin to clean the room with his sister.B．In the Spring Festival, the children often get lucky money.C．How is weather like in spring there?D．You’d better not read a book in the sun.13．This pair of jeans looks nice _____ Sandy, because she looks very nice _____ blue.A．on; in B．in; on C．for; on D．to; in14．Can you jiaozi English?A．say;with B．speak;in C．say;in D．tell;about15．If success is a gate, the road this gate must be made up of difficulties.A．towards B．against C．opposite D．beyond16．Tom and Black clothes store is ______a great sale. It has nice shirts _______all colors.A．at; in B．on; at C．of; in17．After working her way around the world， Annie ended up English as a foreign language. A．teach B．taughtC．teaching D．to teach18．There________ a hamburger and bananas________there.A．is;in B．are;in C．is;/ D．are;/ 19．—What are these ________ English?—These are egg-cups.A．at B．to C．on D．in20．He has a garden __________ a lot of flowers.A．has B．there is C．with21．（2017年安徽） To my pleasure, my family is always _____ me whatever I decide to do. A．above B．behind C．from D．through22．We started out in early spring and headed west the northern part of Asia. A．through B．between C．among D．across 23．Don’t leave the room _____ the light on .A．in B．on C．about D．with24．I want to l earn English well because I don’t want to talk with foreigners ________ anybody else.A．by B．through C．across D．at25．The accident took place ________ a cold February evening.A．on B．in C．at D．for【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】句意：你把可再用的购物袋借给我，真是太好了。
(完整word版)初中介词(表时间地点介词)讲解练习及答案.doc
介词（表时间地点）一、知识回顾介虚，不能独充当句子成分，必同名、代、短、句子构成介短，才能充当句子成分。
介短在句中常作表、定、状和足。
常用表式地点的介介（一）表示的介：1． at, on, in(1)at 表示“在某一刻、某一点”at 5:30 在5:30 at sunrise 日出at lunch 午at noon 正午at night 夜I get up at 6:00 every day.我每天6:00起床。
表示“在⋯⋯” 用at the age of。
⋯如： at the age of five 在五(2)on 表示“在具体某一天或某天的上、下午”。
如：on Monday 在星期一on April 1st 在四月一日I heard a shot on the morning of March 18. 三月十八日早晨我听到一声响。
泛指上、下午、晚上、夜用in the morning/afternoon/evening, at night；但若指具体某一天的上述段，一律用on。
如： on the afternoon of May 23在五月二十三日下午(3)in 表示“在某月、季、年、世”以及泛指的上、下午、晚上。
in September 在九月in winter 在冬季in 1999 在 1999 年in the 20th century 在 20 世in the morning/afternoon/evening 在上午 /下午 /晚上2． for, during, through(1)for 表示“一段”，后接与数用的名。
多与完成用。
I ’ve been a soldier for 5 years我.入伍已 5 年了。
She has been ill for several days. 她已病了几天了。
表示“持一段” ， for 后面必跟“数字 +名”，而 during 后决不可接数字。
12 介词in,on,at 全国通用版(含答案)
语法——介词in on atPart 1:知识点一、介词：是一种虚词，在句子中表示名词或代词与其他词之间的关系，不能单独做为句子成分，常位于名词或代词前面构成介词短语。
二、具体用法：常用介词1.in（1）表示方位：在……里面例句：There are three books in my bag.我书包里有三本书。
（2）表示地点：A.表示在大地方例句：I live in Hangzhou.我住在杭州。
B.表示属于该范围例句：Hei Longji ang lies in the north of China.黑龙江在中国北部。
（3）表示时间：A.表示一段时间（比较长）例：in summer在夏天in 2021在2021年in February 在二月B.表示在早上、下午、晚上例：in the morning/afternoon/evening（4）表示使用某种材料、语言等：例句：I can sing the song in English.我能用英语唱这首歌。
2.on（1）表示地点：在……上面例句：There is an apple on the desk.桌子上有一本书。
（2）表示时间：A.表示在具体某一天的上午、下午或晚上例：on June thirteenth在六月13日on the morning of May 1st在五月一日的早上B.表示在星期几的上午、下午或晚上例：on Friday在周五on Saturday afternoon在周六的下午2.at（1）表示在小地点：例：at school /home（2）表示时间点：例：at seven在七点at night在夜晚Part 2:练习一、用介词填空。
1.My mother begins to work ______ 8:00 ______ t he morning.2.Do you stay ______ home ______ weekend?3.They live ______ a new house now.4.Xinjiang is ______ the west of China.5.Lily usually have breakfast ______ the morning.6.They often have lunch ______ half past twelve.7.What’s this ______ English?8.There is a big gym ______ my school.9.She came to this city ______ 2020.10.It often snows here ______ winter.11.I will be back ______ a month.12.Don’t watch TV too much ______ the evening.13.Sally was born ______ May 11th.14.We don’t go to school ______ Saturday and S unday.15.They were happy ______ that time.16.______ the age of ten, I began to learn English.17.What do you often do ______ noon?18.______ a cold winter morning, I met her in the street.19.Mrs. Green came to Beijing ______ 2005.20.Children wake up very early ______ the morning ofChristmas Day.答案：1.at in2.at on3.in4.in5.in6.at7.in8.in9.in 10.i n 11.in 12.in 13.on 14.on 15.at 16.At 17.at 18.On 19.in 20.on。
(专题精选)初中英语语法知识—介词的分类汇编附答案
一、选择题1．Bill doesn't like playing football，but he often watches football matches (比赛)_____ TV. A．in B．on C．to D．with2．The old man arrived _________ the village _______ a rainy night.A．at; on B．on; at C．in; at D．on; in 3．—What do you think of happiness, Zoe?—I think happiness is a way station too much and too little.A．among B．between C．opposite D．beyond4．The bird’s singing came into my room ______ the window and woke me up in the early morning.A．down B．from C．through D．across5．The moonlight is shining in the window. Everything in the room looks so beautiful. A．over B．through C．across D．past6．She is talented ________ music but I am good at sports.A．at B．in C．on7．Taiwan is __________ the southeast of China and Hunan is __________ the south of Hubei. A．in；in B．in；on C．on；in D．on；to8．The Qingming Festival of this year falls _____ April 5th and thousands of cars poured into high-ways _____ the early morning of the holiday.A．on; in B．in; on C．on; on D．in; in9．He often plays basketball ______five o’clock.A．in B．for C．on D．at 10．Shanghai is ________ the east of China and _________ the west of Japan.A．in; to B．in; inC．to; to D．to; in11．—Where is Tom?—He is playing football ___________ the playground.A．of B．to C．on D．from 12．—What do you use the shelf ______?—I use it ______ books.A．to; to keep B．to; keepC．for; to keep D．for; keep13．— Hey, Nancy. What do you usually do ________ rainy days? — I usually listen to music. A．in B．on C．at D．to14．Can you jiaozi English?A．say;with B．speak;in C．say;in D．tell;about15．（2017年山东德州）A woman stood ______ the window, watching the children playing games in the garden.A．past B．through C．across D．by16．This pair of jeans looks nice _____ Sandy, because she looks very nice _____ blue. A．on; in B．in; on C．for; on D．to; in17．It’s very kind ___________ you to lend me your reusable shopping bags.A．of B．for C．to D．with 18．Nature has given us the ability to learn________watching others. Children do it naturally. A．by B．in C．on19．—What's the weather _______ in Spring?—Pardon?（什么，请再说一遍）—How is the weather________in Spring?A．like;/ B．/;like C．be like;/ D．/;be like 20．There________ a hamburger and bananas________there.A．is;in B．are;in C．is;/ D．are;/21．—Hi, Jane. What time do you get up __________ weekdays?—I usually get up __________ about six o’clock.A．in; at B．on; at C．at; at D．on; on 22．—What are these ________ English?—These are egg-cups.A．at B．to C．on D．in23．（2017年安徽） To my pleasure, my family is always _____ me whatever I decide to do. A．above B．behind C．from D．through24．We started out in early spring and headed west the northern part of Asia. A．through B．between C．among D．across25．My teacher runs ______ the morning. But he doesn't run ______ Sunday morning. A．in；on B．on；in C．in；in D．on；on【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】句意：比尔不喜欢踢足球，但他经常在电视上看足球比赛。
初中英语语法总结：方位介词(有答案)
初中英语语法总结：方位介词(有答案)初中英语语法总结：方位介词表示地点的介词in、on、behind、next to、near、over、under(1). in在……里面：XXX XXX.铅笔在课桌里。
(2). on 在……上面：There are some apple on the tree.树上有些苹果。
(3). under在……下面/正下方：What's under your desk?你书桌底下是什么？(4). over在……正上方：There is a shelf over the table.桌子上方有一个书架。
(5). above在……斜上方：Raise your arms above your head.(6). below在……斜下方：XXX(7).XXX在……之后：There XXX.树后有一辆自行车。
(8).XXX在……旁边：There is a cafénext to the barber's.理发店隔壁是一家咖啡馆。
(9).near在……附近：My bed is near the window.我的床在窗户旁。
(10).by在……旁：XXX.第一组：over, above和on的用法1）over指在…的正上方，表示垂直在上。
如:There is a lamp over the desk.2)above指在上方，属于斜上方。
如：Raise your arms above your head.3)on指在上面，表示两物体接触。
如：There is a cup on the table.第二组：under / below的用法：1) under在……上面/正下方：What's under your desk?2) below在……斜下方：XXX.操演：() 1 The boat is passing___ the bridge.A. XXX() 2 Two planes are flying___ the city.A. XXX, below() 3 We can see a river running to the east____ the XXX() 4 Do you see the kite ___ the building.A. XXX参考谜底C B B D第三组：in和on透露表现“在……上”门一类——镶嵌在墙里的，用in书画一类——挂在墙面上的，用on() 1 He put up a map ___ the back wall because there was a hole ___ it.A. on; onB. at; inC. on; inD. on; at() 2 There is a door___ the wall.A. XXX() 3 Any man ___ eyes______ his head can see that he'XXX.A. with; onB. with; inC. on; withD. in; with鸟一类落在树上的，用in；XXX一类长在树上的，用on() 1 There are some birds singing___ the trees.A. XXX() 2 There are so many apples___ that tree.A. inB, XXX第四组：XXX表示“接壤”第四组：XXX表示“接壤”BABAB在A里——用inA和B相邻（接壤）——用onABA和B不相邻（不接壤）——用to练() 1 The United States is ____ the south of Canada and ___ the east of Japan.A. to; inB. on; toC. in; besideD. at; on() 2 The man stood ____the window, XXX() 3 Japan lies____ the east of China.A. XXX参考答案B B B B第五组：at, in表示“在……”1)at透露表现较小的地址。
2021年初中英语语法知识—介词的分类汇编及答案解析(1)
一、选择题1．---What’s your hobby ? ---______collecting balls, I also like different kinds of CDs. A．Besides B．Except C．Beside D．About2．I bought the tomatoes ________ the vegetable stall.A．at B．in C．on D．from3．—Do you know the girl ________ red skirts?—Yes, she is my sister.A．at B．on C．in D．to4．The Beijing Daxing InternationalAirport opened________ September 25th, 2019.A．to B．at C．in D．on5．The girl often goes to the park many beautiful flowers.A．with B．have C．has D．in6．The elephant is the only animal__________a trunk- a special long nose.A．For B．with C．to7．(2016●泰州市) --As a nurse, her work goes taking care of her patients.--Yes, she always thinks of others.A．beyond B．beside C．behind D．between 8．—Mary's birthday is ________ March． What about Lucy's？—Her birthday is ________ December 10th．A．in；on B．on；in C．on；on9．The moonlight is shining in the window. Everything in the room looks so beautiful. A．over B．through C．across D．past10．It’s necessary for Tony to do ____ thing ____ his classmates do.A．same, as B．same, like C．the same, to D．the same, as11．Jenny’s math lesson is________nine________Friday morning.A．in; on B．at; on C．on; in D．at; in 12．Which of the following(下面) is right?A．The boy begin to clean the room with his sister.B．In the Spring Festival, the children often get lucky money.C．How is weather like in spring there?D．You’d better not read a book in the sun.13．— What kind of home do you ? — A flat three bedrooms.A．live in; with B．live; with C．live in; has D．live; has 14．There________ a hamburger and bananas________there.A．is;in B．are;in C．is;/ D．are;/15．We have four lessons ________ the morning.A．in B．on C．at D．for16．There is an old bridge __________the river. Be careful (小心) when you ________________A．over; across B．over; cross C．on; cross D．on; across17．I can’t go out ________ school nights because I have to finish my homework first.A．at B．in C．on18．My computer game is ______ the drawer and my books are _______ the sofa.A．on; on B．in; in C．on; in D．in; on19．The river runs_______ the city. And there are many beautiful bridges_______ the river. A．across; through B．through; overC．through; through D．across; over20．There is a computer _______ the desk.A．on B．in C．under D．for21．The accident took place ________ a cold February evening.A．on B．in C．at D．for22．It is not easy to cross the river ________ a ropeway.A．from B．with C．by D．on23．If success is a gate, the road this gate must be made up of difficulties.A．towards B．against C．opposite D．beyond 24．—What's the weather _______ in Spring?—Pardon?（什么，请再说一遍）—How is the weather________in Spring?A．like;/ B．/;like C．be like;/ D．/;be like25．He often plays basketball ______five o’clock.A．in B．for C．on D．at【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【详解】句意：---你的爱好是什么？---除了收集球以外，我也喜欢各种各样的CD。
初中英语语法知识—介词的分类汇编附答案解析(1)
一、选择题1．Jim and Tim are talking _______ the phone.A．at B．on C．with D．in2．I bought the tomatoes ________ the vegetable stall.A．at B．in C．on D．from 3．—What do you think of happiness, Zoe?—I think happiness is a way station too much and too little.A．among B．between C．opposite D．beyond4．The elephant is the only animal__________a trunk- a special long nose.A．For B．with C．to5．--There are many theatres _________the island.--Yes, Broadway is the southern end of the island..A．at; at B．on; on C．at; on D．on; at 6．Although he was ____________ my opinion, the old professor didn’t come up with his own. A．against B．on C．for D．in7．—Mary's birthday is ________ March． What about Lucy's？—Her birthday is ________ December 10th．A．in；on B．on；in C．on；on8．Jiangsu Development Summit was open _____ May 20th in Nanjing.A．on B．in C．at D．by9．She is talented ________ music but I am good at sports.A．at B．in C．on10．Taiwan is _________ the southeast of China.A．to B．in C．from D．on11．－What are they talking ________?－I am not sure. Because they are talking ______English, I don't know English .A．to; with B．to; inC．with; about D．about; in12．— Are you going to school________bus?—No, we are going________Mary’s mother’s car.A．by, by B．from, by C．by, in D．in, at13．My computer game is ______ the drawer and my books are _______ the sofa.A．on; on B．in; in C．on; in D．in; on14．I want to learn English well because I don’t want to talk with foreigners ________ anybody else.A．by B．through C．across D．at15．–Emma can go out ________ school nights but she must be back ________ ten o’clock.--Oh, I see.A．on, before B．on, after C．in, before D．in, after 16．There is a computer _______ the desk.A．on B．in C．under D．for17．---Do you prefer coffee _____milk in it?---Sometimes, but most of the time I ______drink black coffee.A．or, would rather B．with, prefer C．with, would rather D．to, prefer 18．Did you read the news________the newspapers that Yang Jiang passed away (去世)________the morning of May 25th?A．in; in B．on; in C．in; on D．on; on19．If success is a gate, the road this gate must be made up of difficulties.A．towards B．against C．opposite D．beyond 20．After working her way around the world， Annie ended up English as a foreign language. A．teach B．taughtC．teaching D．to teach21．—What's the weather _______ in Spring?—Pardon?（什么，请再说一遍）—How is the weather________in Spring?A．like;/ B．/;like C．be like;/ D．/;be like 22．Tom was born________London________May lst, 2001.A．in; in B．in; on C．on; on D．on; in 23．—Hi, Jane. What time do you get up __________ weekdays?—I usually get up __________ about six o’clock.A．in; at B．on; at C．at; at D．on; on 24．Don’t leave the room _____ the light on .A．in B．on C．about D．with25．We usually have our school trip _______ a morning of April.A．on B．at C．to D．in【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】【详解】句意：吉姆和提姆正在电话上交谈。
初中英语介词语法知识点总结(讲义及答案)
初中英语介词语法知识点总结(WORD版本试题+名师解析答案，建议下载练习)一、介词的概念概念：介词一般用于名词或代词前，表示该词与句中其他成分的关系。
I often read English in the morning. Let’s meet at school.He often plays football with them. Thank you for helping me.二、介词的分类(一) 时间介词(二) 地点介词(三) 其他介词★★ (一) 时间介词in: 泛指的早中晚；月份；年份；；in springin the twenty-first centuryon: 某天的早中晚；某天 (日期；周几)；on New Year’s Day on weekends on vacationat: 具体的时刻；；at the age of 20at night / at Christmasduring: 在……期间(+时间段)She lives with us during these days. He visited his aunt during the holiday.before: 在……以前I have to go to bed before 10:00 p.m.after: 在……以后Lily often plays basketball after school.单选( )1. What do you want to do weekends?A. onB. overC. toD. in ( )2. I like swimming summer.A. onB. inC. atD. for ( )3. the age of 26, Lily became a writer.A. OnB. InC. ToD. At( )4. Jim learned to drive ___ the holiday.A. atB. duringC. toD. for( )5. He went to Shanghai July 7, 2013 and came backa cold morning last year.A. in; onB. on; inC. on; onD. in; in( )6. My mom often tells me to go back home dark(黄昏).A. afterB. toC. beforeD. for( )7. A lot of people are here _ vacation every year.A. ofB. onC. atD. with★★ (二) 地点介词1.地点介词 at, in, onat: “在……”(表一个点或小地方)at home at Mr. Cool’s Clothes Storeat the pool at Central Parkin: “在……里” (表一个范围或大地方) in China in Beijing in the water in the parkon: “在……上” (表一个表面，并接触) on the floor on the wall 对比这三个句子：They stood at the door and waited.他们站在门口等着。
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一、选择题1．Bill doesn't like playing football，but he often watches football matches (比赛)_____ TV. A．in B．on C．to D．with 2．—There is a hole in the wall. What is it for?—We have a dog. He can get in or out ________ it.A．past B．through C．across D．over 3．—What do you use the shelf ______?—I use it ______ books.A．to; to keep B．to; keepC．for; to keep D．for; keep4．I bought the tomatoes ________ the vegetable stall.A．at B．in C．on D．from 5．—What do you think of happiness, Zoe?—I think happiness is a way station too much and too little.A．among B．between C．opposite D．beyond6．The bird’s singing came into my room ______ the window and woke me up in the early morning.A．down B．from C．through D．across7．The moonlight is shining in the window. Everything in the room looks so beautiful. A．over B．through C．across D．past 8．Jiangsu Development Summit was open _____ May 20th in Nanjing.A．on B．in C．at D．by9．It’s necessary for Tony to do ____ thing ____ his classmates do.A．same, as B．same, like C．the same, to D．the same, as10．We have four lessons ________ the morning.A．in B．on C．at D．for11．We usually have our school trip _______ a morning of April.A．on B．at C．to D．in12．It is reported that he won an award________Best Actor________his role in that film. A．as; in B．as; for C．for;for D．for; in13．--Which is your teacher?--The one thick(厚厚的)glasses over his eyes is．A．wears B．wear C．with D．has14．I want to learn English well because I don’t want to talk with foreigners ________ anybody else.A．by B．through C．across D．at15．It is not easy to cross the river ________ a ropeway.A．from B．with C．by D．on16．---Do you prefer coffee _____milk in it?---Sometimes, but most of the time I ______drink black coffee.A．or, would rather B．with, prefer C．with, would rather D．to, prefer 17．It’s very kind ___________ you to lend me your reusable shopping bags.A．of B．for C．to D．with 18．Nature has given us the ability to learn________watching others. Children do it naturally. A．by B．in C．on19．—What's the weather _______ in Spring?—Pardon?（什么，请再说一遍）—How is the weather________in Spring?A．like;/ B．/;like C．be like;/ D．/;be like20．I have to prepare ________my math test________ Friday afternoon.A．at; on B．for; on C．on ;for21．—Where is Hubei?—It’s _______ the north of Hunan.A．in B．to C．on22．He has a garden __________ a lot of flowers.A．has B．there is C．with23．We started out in early spring and headed west the northern part of Asia. A．through B．between C．among D．across 24．Don’t l eave the room _____ the light on .A．in B．on C．about D．with25．The river runs_______ the city. And there are many beautiful bridges_______ the river. A．across; through B．through; overC．through; through D．across; over【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】句意：比尔不喜欢踢足球，但他经常在电视上看足球比赛。
在电视上用介词on，故答案为B。
2．B解析：B【解析】【详解】句意：——墙上有个洞。
这是干什么的？——我们有一条狗。
他可以通过它进出。
考查介词辨析。
past在另一边；到另一侧；through通过，内部的通过；across横穿，从一般到另一边；over上方，穿过。
根据“We have a dog. He can get in or out”可知下文是“小狗可以通过它进出”，根据题意，故选B。
3．C解析：C【解析】【详解】句意：——你使用那个架子干什么？——我用它来保存书籍。
考查介词用法和不定式作宾语补足语。
to表示目的或意图；keep保存；for为了。
分析句子结构可知要用介词for与疑问句what搭配表示“为了什么”，to后需接动词原形构成不定式，不符合题意；use sth. to do sth.用某物来做某事，第二空用动词不定式表目的。
故选C。
4．A解析：A【解析】【分析】【详解】句意：我在蔬菜店买了西红柿。
考察地点介词。
at后跟小地点，in 后跟大地点，on 表示在….上面，from表示来自。
这里the vegetable stall 是一个小地点，所以前用介词at。
5．B解析：B【解析】【分析】【详解】句意：——Zoe，你怎样看待幸福？——我认为幸福是介于太多和太少之间的一个中转站。
考查介词辨析。
A. among在…中间，指三者或三者以上的中间；B. between在…之间，在两者之间；C. opposite在…的对面；D. beyond超过、超越。
根据I think happiness is a way station too much and too little.可知句意为“我认为幸福是介于太多和太少之间的一个中转站。
”由后面的too much and too little，可知是介于两者之间，所以应用between，故答案选B。
6．C解析：C【解析】【详解】句意：鸟儿的歌声透过窗户进入我的房间，一大早就把我吵醒了。
本题可用“语境分析法”解答。
down“沿着；向下”；from“来自”；through“（从物体内部或空间）穿过”；across“（从物体表面）穿过”。
由句意“鸟的歌声从窗户传进我的房间……”可知选C。
7．B解析：B【解析】【分析】【详解】句意：月光正透过窗户照进来。
房间里的一切看起来非常漂亮。
本题考查介词辨析。
over在上方越过；through从中间穿过；across从表面穿过；past经过。
结合句意，月光透过窗户进来，故用through。
故选B。
8．A解析：A【解析】句意：江苏发展峰会于5月20日在南京开幕。
考查介词辨析题。
表示时间的某一点、某一时刻或年龄等用 at；泛指一般意义的上午、下午或晚上以及月或年等较长的时间，一般用 in；若表示星期几或某一特定的日期，则用 on；表示“到……时为止”或“不迟于……”用by。
本句May 20th是特定日期，需用on。
根据句意语境，可知选A。
点睛：时间介词是英语中的经典考题。
表示时间的介词很多：一、at, on, in (A) at表示“在某一时刻，某一时点”；(B) on表示“在具体某一天或某天的上、下午”；(C) in表示“在某世纪、年、季度、月、周”以及泛指的上、下午、晚上。
二、for, during, through (A) for后接“一段时间”，表示某事持续多久，后接时间段，多与完成时连用；(B) during表示“在……期间”；(C) through表示“一直……，自始至终”。
三、from, since (A) from表示“时间的起点”，可译作“从……”，多用于“from…to/till…”中；(B) since表示“自从……以来（直到现在）”，后接时间点。
四、before, by, till, until (A) before指“在……之前”，与after相对；(B) by指“不迟于，到……时为止，在……以前”；(C) till (until) “直到……为止”。
五、after, in, within(A) after表示“在……之后”，是before的反义词；(B) within“在……时间之内”。