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People living in the area where there is a lack of electricity often keep a supply of candles ________power failure.?
A．in case ofB．onceC．even ifD．in course of
A?
判斷邏輯。此處為目的,in case of意思是“萬一……”,in course of“在……過程中”,once是連詞,用在此處句意不通。?
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