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1.My sister isn't in.________ she comes back,I'll let her call you back.(  )
A.WhileB.UntilC.BeforeD.When

分析 我的妹妹不在家,当她回来的时候,我让她给你打回去.

解答 答案:D;
根据语境推测句意是"我的妹妹不在家,当她回来的时候,我让她给你打回去.",在这里从句用的是一般现在时,表示"当…时"用when;while引导的从句通常用进行时,表示动作延续的过程.故选D

点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键;还要根据句中信息正确推测该句句意,进而作出解答.

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