[题目] he was sleeping, Sam knocked at the door.A.WhileB.DuringC.AsD.If 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】_______ he was sleeping, Sam knocked at the door.
A.While
B.During
C.As
D.If

【答案】A
【解析】句意：当他正在睡觉的时候，山姆敲门。while后通常跟进行时态，表示某个动作正在发生或者动作的持续。during在……期间，介词不引导从句；as强调主从句动作时间一般是持续相同时间；if如果，不合题意。故选A。

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