1.Mum told Tom that he could not go out with his friends unl

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1.Mum told Tom that he could not go out with his friends unless his homework_________.
A.is done B,was finished C.has finished.D.would be done.
请解释这个是什么时态,选B是为什么,为什么不选C.
2.I won't have a trip to Yellow Mountain unless my best best freind Mary _____,too .
-You mean you will go if Mary goes?
A.will invite B.invites C.is invited D.will be invited.
3.Which sports do you prefer ,running or swimming?
-________,and I also like climbing very much.
A.both B.neither C.Either D.none
A和C有什么区别啊?
4.Do you know Tony very well?
Yes,He and I ___friends since we met in Guangzhou last year.
A.have become B.have got C.have been D.have made
每一题都要详解,
感激不尽!

1、因为这里homework应该是被完成,所以应该被动语态~用be动词加动词的过去分词表示~所以B选项正解~
2、选C,跟前面一样~被动语态,翻译过来是如果Mary被邀请我才会去,这里需要用被动语态表示“被邀请”~用be加过去分词
3、正解是A对吧?注意啦~原意是要表达“我两样都喜欢,同时还喜欢.”,both是指的“两个都”,而“either”是指的“两个中的任何一个”,根据题意,both是正解咯~
4、正解C对不?这里还是要注意语态问题哈~A、B、D答案的动词都是短暂动词,不能和“since”这样一个表示长期的短语搭配表示过去完成式.这个说起来有点复杂.建议还是问一下老师,让老师系统地跟你讲解一下哦~

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