英语单选题What a pity!Considering his ability and experience,he _

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英语单选题
What a pity!Considering his ability and experience,he _____better.
A.can have done B.might have done
根据语义,这个空本可以填could have done ,可是没这个答案,于是我就选了A,可might have done 是表示可能已经做过某事,怎么也不能选这个啊

情态动词should ,would,could,might,ought to等后接不定式的完成时,
表示过去本该做,打算做,想做而未做的事情．
should have done =ought to have done本应该做而没做
would have done = 本来就会去做某事而没做
could have done = 本可以做某事而没做
might have done本可以做而没做

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