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。