3.-What do you think the noise was?  --It ___________ a cat.  A.may be       B.might be      C.could have been      D.might have beenD 为什么B不可以啊?

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3.-What do you think the noise was?  --It ___________ a cat.  A.may be       B.might be      C.could have been      D.might have beenD 为什么B不可以啊?
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3.-What do you think the noise was?  --It ___________ a cat.  A.may be       B.might be      C.could have been      D.might have beenD 为什么B不可以啊?
3.-What do you think the noise was?  --It ___________ a cat.  A.may be       B.might be      C.could have been      D.might have been
D 为什么B不可以啊?

3.-What do you think the noise was?  --It ___________ a cat.  A.may be       B.might be      C.could have been      D.might have beenD 为什么B不可以啊?
情态动词表推测时他们的过去式并不表示过去发生的事,情态动词对过去的推测的结构通常都是could/should/might+have done