【題目】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】

試題分析：考查固定用法。sb be about to do sth when sth happen.某人正要做某事突然（就在那時(shí)）另一件事情發(fā)生了。此處的when相當(dāng)于 at that time，不能用while代替。故選B

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