We jump to conclusions before we have all the facts.
A. couldn't
B. mightn't
C. shouldn't
D. mustn't
网友回答
A. couldn't
B. mightn't
(答案→)C. shouldn't
D. mustn't
解析：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。