He ________ the exam, but he was too careless.

A．could have passedB．couldn’t have passed
C．must have passedD．may have passed

A

解析試題分析：此處could have passed the exam表示本能通過考試，實際上沒有。句意：他本能通過考試的，但是他太粗心了。
考點：考查虛擬語氣的用法。

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