【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
在线课程【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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