Someone ______ at the door. Can you open it?

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

C

解析試題分析：句意:有人在敲門，你可以去開(kāi)一下嗎？knock敲，knock at the door是一個(gè)固定的短語(yǔ)，意思是敲門。根據(jù)句意和這個(gè)情景可知，現(xiàn)在有人正在敲門，故應(yīng)該用現(xiàn)在進(jìn)行時(shí)，故選C。A是一般現(xiàn)在時(shí)第三人稱單數(shù)形式；B是一般過(guò)去時(shí)；D是過(guò)去進(jìn)行時(shí)。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)。

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