题目内容
My parents live in a small village.
They always keep candles in the house _____ there is a power out.
They always keep candles in the house _____ there is a power out.
[ ]
A. if
B. unless
C. in case
D. so that
B. unless
C. in case
D. so that
C
练习册系列答案
相关题目