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几道单选题(写出原因,)

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几道单选题(写出原因,)
1.You don't have to describe her.I _______ her several times.
A.had met B.have met C.met D.meet
2.-Mum,may I go out to play football?
-__________you ___________ your homework yet?
A.Have;finished B.Do;finish C.Are;finishing D.Did;fish
3.The police_______ for that man_______five hours ago.
A.have waited,for B.has waited,since C.has waited,for D.have waited,since
1.B:意思是:我已经见过她几次了.所以用完成式,但是没有必要用过去完成式,现在完成式就可以了
2.A:yet都是和完成式搭配的
3.B:第三人称单数用has,ago不和for搭配的.
for后面一般连一段时间:I have been waiting for him for 3 hours.