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【题目】Listen! Who ________ the front door?

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

【答案】C

【解析】

句意:听!谁在敲门?选项中knock为不及物动词,其后接宾语时,应加介词on/at。由“Listen!”可知动作正在进行,应用现在进行时,故选C。

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