问题
选择题
My parents live in a small village. They always keep candles in the house ____ there is a power out.
A．if
B．unless
C．in case
D．so that
答案
答案：C
本题考查连词用法。If如果；unless除非；in case 以防；so that目的是。句意：我的父母住在一个小村庄里。他们一直保留着蜡烛以防房子里停电。