Someone ______ at the door. Can you open...

Someone ______ at the door. Can you open it?

A.knocks B.knocked

C.is knocking D.was knocking

C 【解析】试题句意:有人在敲门，你可以去开一下吗？knock敲，knock at the door是一个固定的短语，意思是敲门。根据句意和这个情景可知，现在有人正在敲门，故应该用现在进行时，故选C。A是一般现在时第三人称单数形式；B是一般过去时；D是过去进行时。

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