Listen! Someone ________ at the door. Pl...

Listen! Someone ________ at the door. Please go and answer it.

A. knocks

B. is knocking

C. has knocked

D. was knocking

B 【解析】句意：听!有人在敲门。请去看一看。像Listen，look， now等表示现在时间，要用现在进行时态，现在进行时的构成：be+doing；根据Listen!可知现在的时间，要用现在进行时态，结合句意和语境可知选B。

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