must have done用法he said that the passenger （ B ）anaccident;otherwise he would have arrived by that time. A must haveB must have hadC would have hadD should have had麻烦高手解释一下

He must have done nothing but ____ 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 have done用法he said that the passenger （ B ）anaccident;otherwise he would have arrived by that time. A must haveB must have hadC would have hadD should have had麻烦高手解释一下 情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done must have been done must have done should have done .would have done. must have done三者之间的意思和用法上有什么区别? where must the puma have come from 其中must have done是什么用法? 情态动词加上完成时的意思?could not have done must not have done should not have done would not have done 以及它们的用法? He's doing his homework which he _____ last nightA.ought to doB.must have doneC.could be doneD.should have done选那个？为什么？ needn't have done用法needn't have done 用法 这是个什么句型?还有别的吗?别如must't have done等 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 have done 和gave been done的用法last night it must have been rained为什么错 雨是被下的,所以我觉得应该用have been done. that must have done the must have donemust have done 的用法详细说明.可以归结为虚拟语气里面的么?must have been down 是must have down 的被动语态么 must be must have done 区别