【題目】Someone ________ at the door.Can you open it?

A. knocks B. knocked C. was knocking D. is knocking

【答案】D

【解析】

句意：有人在敲門。你能去開一下門嗎? 本題主要考查現(xiàn)在進(jìn)行時(shí)。題中：knock 敲（門、窗等）；knock at the door敲門，是固定短語。Someone泛指有人，某人。A. knocks描述一般現(xiàn)在時(shí)；B. knocked描述過去時(shí)態(tài)；C. was knocking 描述過去進(jìn)行時(shí)； D. is knocking描述現(xiàn)在進(jìn)行時(shí)。依據(jù)題意及語境，現(xiàn)在有人正在敲門，應(yīng)該用現(xiàn)在進(jìn)行時(shí)，故正確答案為：D。

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