问题
选择题
He ________ the exam, but he was too careless.
A．could have passed
B．couldn’t have passed
C．must have passed
D．may have passed
答案
答案：A
题目分析：此处could have passed the exam表示本能通过考试，实际上没有。句意：他本能通过考试的，但是他太粗心了。
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