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【题目】I was about to go to bed ________ there was a knock at the door.

A. while B. when C. as D. suddenly

【答案】B

【解析】

试题分析:考查固定用法。sb be about to do sth when sth happen.某人正要做某事突然(就在那时)另一件事情发生了。此处的when相当于 at that time不能用while代替。故选B

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