He the test, but he wasn't careful enough. A. could have passed B. were able to pass C. must have passed D. might be able to pass 题目和参考答案——青夏教育精英家教网——

题目内容

He ________ the test, but he wasn't careful enough.

A. could have passed

B. were able to pass

C. must have passed

D. might be able to pass

答案：A
解析：

Could + 完成时态，表示对过去事情的可能推测。

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