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【题目】Someone ______ at the door. Can you open it?

A. knocks B. knocked

C. is knocking D. was knocking

【答案】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CA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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