【題目】—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

【解析】

句意：——山姆今天做完作業(yè)了嗎？——我不知道。他今天早上在做�？疾闀r(shí)態(tài)辨析題。this morning今天早上，用于過去時(shí)；根據(jù)句意語境，可知“今天早晨我看見他時(shí)他正在做作業(yè)，現(xiàn)在完沒完不知道”，需用過去進(jìn)行時(shí)，故選C。

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