He must have done his homework last night,didn't he? 这里为什么用didn't而不用haven't?错了 是 hasn't

He must have done nothing but ____ must have been done must 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 he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反 he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反 that must have done the He will have to stay in hospital.That’s what he____a has done b must do c must be doing d must have done为什么C不对呢 must be must have done 区别 what a pity considering his ability and experience,he ( )better.A.need have done B.mA.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 must have been done/must be done求解两者异同 must be done和 must have done区别 He must have done it last night,____he 这个反意疑问句怎么做啊 must have done和have done有什么区别 i believe he ____an accident ,otherwise he would have arrived on time为什么选must have had could/would/should/must have done 有什么区别, what a pity considering his ability and experience,he __better.A need have done B must have done C couldf have done D might have done 为啥选D不选C must have been与must have done的区别? must have done 的反义疑问句怎么说