What a pity! Considering his ability and experience, he have done better.
A. need
B. must
C. might
D. can
网友回答
A. need
B. must
(答案→)C. might
D. can
解析：考察情态动词用法。Need have done本需要做某事，实际上却未做；must have done一定做了某事；might have done也许做了某事；can have done可能做了某事（用于疑问句或者否定句）。句意：真遗憾啊！考虑到他的能力和经验，他本可以做得更好的。故C正确。