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，你可以去開一下嗎？knock敲，knock at the door是一個固定的短語，意思是敲門。根據(jù)句意和這個情景可知，現(xiàn)在有人正在敲門，故應該用現(xiàn)在進行時，故選C。A是一般現(xiàn)在時第三人稱單數(shù)形式；B是一般過去時；D是過去進行時。
考點：考查動詞時態(tài)。

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