must have done ,can have donemust have done,can have done分别表示什么意思?在何种场合用?请具体解释下,并分析区别,具体精炼些,

must have done,must do,can't have done,can't do的区别 must have been done must have done 有must/could/can/may/maight have been done吗 can't have been和can' have done有什么区别或者must have been和must hane done;may have been和may have done 用must have been/done或can*t have been/done 改写句子 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 need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明, 分析一下can may must could might could have分析一下can may must could might could have done might have done等 that must have done the can’t +have done 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 英语的几道语法问题求解can/would/must/need +have done各个的用法 must have done和have done有什么区别 一道高三的英语单选题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 解析请具体 有针对性一点