can't与must'tIt（ ）be Helen.She has gone to Beijing .括号中应选can't还是must't

can't与must'tIt（ ）be Helen.She has gone to Beijing .括号中应选can't还是must't can't be 与 must be的区别 存在can be/must be ,can’t be 而没有mustn't be What can't be cured must be endured 关于have to/must be与don't have to/can't behave to与must bedon't have to与can't be的意思一样,在使用过程中有何区别 she looks very young.she ( )more than forty.A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案） 单项选择 Something（） wrong with the clock.It doesn't workA.must be B can’t be C could be D mustn‘t be Must be persever.Can't give up.这句话对吗? can be 我知道can't be 一定不是 是must be 一定是的否定形式 be,must be,can't have been,must have been吗 为什么must be的否定式是can't be而不是mustn't be Today is Wednesday.He _______be at home.He ______ be at school.A.can’t,can B.can’t,must C.mustn’t,must D.mustn’t,can must be,may be,can't be 表推测的意思 并造句 may be后加动词的什么形式还有can't be must be等 can't be和must be 后是动词be去不去 He must be fifty,________?A.mustn't he B.can't C.must he D.mayn't he can,can't,must,mustn't,needn't,be allowed to,have to,don't have to的区别 can't be 和 must’t be有什么区别?比如，he can't be here.he mustn;t be here 有什么区别？