【題目】I was watching TV when someone _______ the door.

A. were knocking at B. knocked

C. knocked at D. knock at

【答案】C

【解析】

試題分析:句意:當(dāng)在看電視時(shí),此時(shí)有人敲門。knock at 敲門;when引導(dǎo)的時(shí)間狀語從句,當(dāng)放在過去進(jìn)行時(shí)構(gòu)成的主句之后時(shí),表示某事正在進(jìn)行時(shí),另一件事情發(fā)生了。依據(jù)句意,答案為C。

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