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Someone ______ at the door. Can you open it?

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

C

解析试题分析: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。
考点:考查动词时态。

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