All that has happened is heart-breaking. In fact, a little more carefulness _____ this tragic event. A.would have prevented B.should prevent C.could prevent D.must have prevented

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题目内容（河南城建学院-大学英语2）

All that has happened is heart-breaking. In fact, a little more carefulness _____ this tragic event.

A.would have prevented
B.should prevent
C.could prevent
D.must have prevented

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