As a graducate in computer science, he ___ to work out the problem. A. wouldn't have faile

As a graducate in computer science, he ___ to work out the problem.

A. wouldn't have failed  B. can't have failed  C. mustn’t have failed  D. might not have failed

答案

B


解析:

can’t/couldn't have done表示对过去发生的事情的否定推测。

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