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We ________ jump to conclusions before we have all the facts.
A.couldn'tB.mightn'tC.shouldn't D.mustn't
C
C 考查情态动词。句意:我们不应该在掌握全部事实前草率下结论。shouldn't“不应该”;couldn't“不能”;mightn't“可能不”;mustn't“禁止”。根据句意可知应选C项。
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