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【题目】— 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。Aunless如果不,除非;引出条件状语从句;Bonce一旦……,引出时间状语从句;Cwhen……时;Dwhile……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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