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1.We've decided to hold a football match next week.Will you

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1.We've decided to hold a football match next week.Will you ____
A.take part in B.attend us C.join D.play a part
为什么不选A?
2.—Has John arrived yet?—No ,he ___an hour ago.
A.was supposed to come
B.must have done
C.should come
D.ought to have come
3.In those days,whenever I had difficulies,I ___Mr.Red for help.
A.was used to going to
B.was used to go to
C.would go to
D.used to going to
为什么不选A
4.Things fall to the ground___go up into the air because of gravity.
A.instead of B.than
C.rather than D.in place of
为什么
1.We've decided to hold a football match next week.Will you
1B take part in指参加会议或群众性活动等,重在说明句子主语参加该项活动并在活动中发挥作用.如:We’ll take part in social activities during the summer vacation.
我们在暑假期间将参加社会活动.
We often take part in physical labour.我们经常参加体力劳动.
join in指参加比赛或活动等,常用于日常口语.如:
Almost all the teams in our school joined in the basketball tournament.我校几乎所有的队都参加了这次蓝球锦标赛.
Why didn’t you join in the talk last night?你为什么昨晚不参加座谈?
如果要表示“加入到他人的行列一道从事某项活动”,则要用join sb.in sth..如:
Our headmaster will join us in the discussion this afternoon.
校长今天下午要参加我们的讨论.
Her husband joined her in her search for this unknown radiation.她的丈夫和她一道寻找这种不知名的射线.
注意:参加说话人双方都清楚的活动时,in sth可以省略.如:
Come and join us,Xiao Wang.小王,快来和我们一起玩吧.
但这道题后没有us,所以不选C
2 D 题干用的是完成时答句的意思是“他本应该一小时前就来的”should have done是本应该的意思,而ought to等同于should,be supposed to也有“应该”的意思,但主语为人时表“应该”,为物时表“本应该”具体去
3 C be used to doing sth 表示习惯于做某事.我觉得可以这么理解.但你翻译成中文看看,只要我遇到困难,我习惯于向瑞德求助.而would是will的过去式,其是一个情态动词,可表一种愿望,遇到困难心里想向他求助,是不是更好一些呢?所以我觉得选C更好http://zhidao.baidu.com/question/91185720.html?si=1是would的用法
4 C这道题只要知道意思就可以选了
题面的意思是“物体由于重力的缘故落向地面而不是升上天空” rather than 强调了是A不是B ,用instead of则后面应该用going所以不选,建议你把instead 和rather than的用法比较一下.