题目内容

Someone ______ at the door. Can you open it?
A．knocksB．knocked
C．is knockingD．was knocking
C

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。
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