题目内容

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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