单项选择 适中0.65 引用5 组卷1036
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 |
2007·重庆·高考真题
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Pandas are facing danger! The situation won’t change humans stop killing.
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A.While | B.Until | C.If | D.Before |
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