【題目】My parents live in a small village. They always keep some candles in the house __________ there is a power off.

A. if B. unless

C. in case D. so that

【答案】C

【解析】句意：我父母生活在一個小村里。他們總在家中備好蠟燭，以防停電。if如果；unless除非，如果不case以防，以防萬一；so that以便，以至于。結(jié)合句意選C。

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