单项选择题

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
— I hear that Jack had a car accident yesterday.
— I won’t believe it. He ______.

A.shouldn’t have been so careless
B.wouldn’t be so careless
C.couldn’t be so careless
D.mustn’t be so careless
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