what a pity considering his ability and experience,he ( )better.A.need have done B.m

题目

what a pity considering his ability and experience,he ( )better.A.need have done B.m
A.need have done B.must have done C.can have done D.might have done
为什么不选C啊 给我讲讲吧

答案

其实BCD的意思都对,但是这里是虚拟语气,他本应该做的更好.
对过去状况的虚拟,所以应该用过去时,从形式上只有D是对的.