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【题目】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:我父母生活在一个小村里。他们总在家中备好蜡烛,以防停电。if如果;unless除非,如果不case以防,以防万一;so that以便,以至于。结合句意选C。

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