— 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

 

【答案】

 C

根據(jù)題干，語境應(yīng)為“我不知道，今天早晨他還在做”，A為一般過去時，強調(diào)在過去 某一時間做某事，不強調(diào)結(jié)果；B為現(xiàn)在完成時，在過去發(fā)生，強調(diào)對現(xiàn)在的影響；C為過 去進(jìn)行時，指在過去某一時間正在做某事；D為過去完成時，表達(dá)過去的過去。所以C為正確答案。

 

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