问题
选择题
| 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 |
答案
答案：C
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| 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 |
答案：C