问题
选择题
My parents live in a small village. They always keep candles in the house ___ there is a power cut.
A．if
B．unless
C．in case
D．so that
答案
答案：C
根据句意可知留蜡烛在家里是为了以防万一停电。in case意为“以防万一”；if 引导条件状语从句,意为“如果”；unless引导让步状语从句,意为“如果不”；so that引导目的状语从句,意为“为了”。