. What a pity. Considering his ability and experience, he better.
A. need have done
B. must have done
C. can have done
D. might have done
网友回答
A. need have done
B. must have done
C. can have done
(答案→)D. might have done
解析：根据语法规则可知A和C不对，因为need和can用作情态动词时通常只用于否定句或疑问句，不用于肯定句；再根据句意，选D最佳。句意为：真是遗憾！考虑到他的能力和经验，他本来可以做得更好的。