My parents live in a small village. They always keep candles in the house there is a power out.A. if

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【题目】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

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【答案】C

【解析】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。