---- Has Sam finished his homework today?

---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A.did B.has done C.was doing D.had done
炎雪炎雪 1年前 已收到1个回答 举报

sean_why 幼苗

共回答了16个问题采纳率:93.8% 举报

C

考查时态。句意:今天Sam完成作业了吗?我不知道,他今天上午在做。表示过去某一时刻进行的动作用过去进行时态。根据题意上午那个时刻他在做作业,故选C。

1年前

1
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