Some hard working students always keep a torch in their dormitories _____ there is a power failure． ...
2022-10-22 10:29:43 196次 2014-2015学年湖南省怀化市高三一模考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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