He ____ the test,but he wasn't careful enoughA.could have passed B.were able to passC.must have passed D.might be able to pass为什么选A?

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He ____ the test,but he wasn't careful enoughA.could have passed B.were able to passC.must have passed D.might be able to pass为什么选A?

He ____ the test,but he wasn't careful enoughA.could have passed B.were able to passC.must have passed D.might be able to pass为什么选A?
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
为什么选A?

He ____ the test,but he wasn't careful enoughA.could have passed B.were able to passC.must have passed D.might be able to pass为什么选A?
他 应该能 (虚拟语气 - 过去应该发生,而实际没有发生的事情)通过考试,但是(因为他)不够仔细 (实际上而没能通过)
这种情况,用 could have done 结构