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(dòng)詞。句意：我們不應(yīng)該在掌握全部事實(shí)前草率下結(jié)論。shouldn't“不應(yīng)該”；couldn't“不能”；mightn't“可能不”；mustn't“禁止”。根據(jù)句意可知應(yīng)選C項(xiàng)。
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