. What a pity. Considering his ability and experience, he _________ better.
A．need have doneB．must have done
C．can have doneD．might have done
D。
根據(jù)語法規(guī)則可知A和C不對(duì)，因?yàn)閚eed和can用作情態(tài)動(dòng)詞時(shí)通常只用于否定句或疑問句，不用于肯定句；再根據(jù)句意，選D最佳。句意為：真是遺憾！考慮到他的能力和經(jīng)驗(yàn)，他本來可以做得更好的。
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