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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　考查情態(tài)動詞。句意：我們不應該在掌握全部事實前草率下結論。shouldn't“不應該”；couldn't“不能”；mightn't“可能不”；mustn't“禁止”。根據句意可知應選C項。
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