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【题目】【2016湖北黄石 What were you doing ______ I knocked at the door?

I was sleeping.

A.unless B.once

C.when D.while

【答案】B

【解析】

试题分析:句意:-我敲门时,你在做什么?-我在睡觉。A.unless如果不,除非;引出条件状语从句;B.once一旦……,引出时间状语从句;C.when当……时;D.while当……时,后跟延续性动词。本题表示……,knock是非延续性动词,故选B。

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