He must have learn English for three years,___?A.hasn't he B.haven't he C.mustn't he D.didn't he要理由,谢谢

He must have learn English for three years,___?A.hasn't he B.haven't he C.mustn't he D.didn't he要理由,谢谢 He must have learn English for three years,___?A.hasn't he B.haven't he C.mustn't he D.didn't he网上有这种说法：陈述部分有must 的疑问句,疑问部分根据实际情况而定.He must be a doctor,isn't he?You must have studied English f He must have learn English for three years,___? A.hasn't he B.haven't he C.mustn't he D.didn't he为什么选B 不选D不还意思看错选项了 是A He must have done nothing but ____ He looks tired,he _______ too little sleep.A must have had B must have C must have been is it he must have fallen or he must have fell?whythank you He must have been ill,___ he?如何变反意疑问句 He can't find his key.He ---------- them.A.must lost B.must have been lost C.must have lost What must one do if he wants to learn another language well?What must one do if he wants to learn another language well? he hopes his students will have fun_____english(learn） 翻译He did not have to make them learn We must learn it e.g Why did Tom go to Japan?He went to Japan to learn Japanese.则Why is Mrs Brown in hospital?(have a baby)怎么改? must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be he must have read this book yesterday?反问?did not he?have not he?为什么 He must have come have yesterday ,didn'he?这里的have是什么意思?这句是什么时态? He must have been away 哪个是情态动词 是must还是have同上 i think he must have been a mechanic,中的must和have been是什么词啊?