---Have you done your homework,Bob?
---Yes,I____it twenty minutes ago.
A.have done B.did
C.had done D.do
正确答案是B,为什么A不行?
人气：399 ℃ 时间：2019-08-26 07:30:16
解答
twenty minutes ago是过去时间
具体描述一个动作发生的时间、地点、方式等情况要用过去时.
have done 是现在完成时,不能和twenty minutes ago搭配.
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