My parents live in a small village. They always keep candles in the house there is a powe

问题补充：

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

A. if

B. unless

C. in case

D. so that

答案：

A. if

B. unless

(答案→)C. in case

D. so that

解析：in case意为“以防万一”，又如：I bought the car at once in case he changed his mind. 我马上买下了那辆汽车，以免他变卦。I don’t let him climb trees in case he tears his trousers. 我不让他爬树，以免撕破裤子。