题目内容

My parents live in a small village. They always keep candles in the house ____ there is a power out.
A．ifB．unlessC．in caseD．so that
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。
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