What a pity! Considering his ability and experience he better.A. need have doneB. must

问题补充：

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

答案：

A. need have done

B. must have done

C. can have done

(答案→)D. might have done

解析：“What a pity!”暗示他的表现令人遗憾。鉴于他的能力和经验，他本来可能发挥得更好，因此用might have done，最佳答案为D。