what a pity considering his ability and experience ,he _betterA,need have done B,must have done C,can have done D,might have done

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what a pity considering his ability and experience ,he _betterA,need have done B,must have done C,can have done D,might have done

what a pity considering his ability and experience ,he _betterA,need have done B,must have done C,can have done D,might have done
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

what a pity considering his ability and experience ,he _betterA,need have done B,must have done C,can have done D,might have done
D) might have done带有本来也许可以的意思.
C) 应改为could have done .

C
虚拟语气用法,他本来可以做得更好的。