I was watching TV when someone _______ t...

I was watching TV when someone _______ the door.

A. were knocking at B. knocked

C. knocked at D. knock at

C 【解析】试题分析：句意：当我在看电视时，此时有人敲门。knock at 敲门；when引导的时间状语从句，当放在过去进行时构成的主句之后时，表示“某事正在进行时，另一件事情发生了”。依据句意，答案为C。考点：考查从句的动词。

考点分析：

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