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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】C
【解析】考查连词辨析。句意:-我敲开门时,你在做什么?-我在睡觉。A. unless 如果不,除非;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“当……时”,knock是非延续性动词,故选B。

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