A.must be B.may have been C.can have been D.could be ,为什么呢,Although there is no life on Mars now,some scientists think that there______some form of life a long time ago.

I parked my car right here but now it's gone.It ____ .A must have been stolen B must have stolenC may be stolenD must be stolen She didn't hear the phone.She ___ asleep.A may be B must be C should have been D must have been You ___ be more careful next time.A.have to B.may C.must D.had to选什么?为什么? Who ------it be?It must be Mr.Wang A may B must C might D can ---What ever happened to Tom?---He lost.A.must be B.should have got C.may have got D.might be(为什么是表可能?) Ask Li Mei,he ------know the answer .A、may be B、 maybe C、may D.must The May Day Holiday____over,we must now get down to work.A)be B)being C)to have been D)to be The May Day Holiday____over,we must now get down to work.A)be B)being C)to have been D)to be但是为什么啊 When did you first visit China?I think it _____in 1996,when my parents were teaching in YunnanUniversity.A.must be B.should have been C.may be D.must have been其余选项为什么不对,尤其是A? there _____ fights to other planets. a. may be b.must have c.maybe' d.can't has.there _____ fights to other planets.a. may beb.must havec.maybe'd.can't has（要详细的解答!） be careful!A car___.It__hit youA.is coming,may B.comes,must C.is coming,must D.comes,may 英语翻译A.may be B.can be C.maybe D.must其实也就是 may be 和maybe的区别 25.He went away without answering my question where the post office was.He _______a dumb man.A.may be B.must be C.can have been D.must have been Some aspects of a pilot's job ___ be boring,and pilots often ____ work atinconvenient hours.A can,have to B may,can C have to ,may D ought to,must答案是A.其他选项为什么不能选 you MAY BE HAVE A 关于情态动词的用法You _____ be tired; you have been working for so long a time,but he _____ be tired; he has just begun to work.A.may not; must B.must; may notC.can’t; must D.must; can’t我选的是B 但是 我知道的是can 表示逻 You must be ＿nest time,or there may be another accident.A .carefully.B.careful. You ( )be tired .you have only been working for an hour.A.must B.wont C.cant D.may not