Question

【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

Answer 1

【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。