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【题目】Some hard working students always keep a torch in their dormitories _____ there is a power failure.

A. if B. unless

C. so that D. in case

【答案】D

【解析】A. if 如果B. unless 除非C. so that因此D. in case万一。根据句意:一些学习刻苦的学生通常在宿舍备一个手电筒以防停电。选D。

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