he must be helping the old man to water the flowers,Ais he Bisn't he Cmust he Dmustn't he

he must be helping the old man to water the flowers,Ais he Bisn't he Cmust he Dmustn't he 238.He must be helping the old man to water the flowers,_______?（陕西）A.is he B.isn’t he C.must he D.mustn’t he 说明原因. 1.——the project in time,the staff were working at weekends.A.Completing B.Having completed C.To have completed D.To complete2.He must be helping the old man to water the flowers,A.is he B.isn't he C.must be D.mustn't be3.He found a lot of _were_. He must be ill ,for he isn't here. He must be fifty,________?A.mustn't he B.can't C.must he D.mayn't he He must be still there,____ A.mustn't he,B.isn't he C.must he.D.is heHe must be still there,____ A.mustn't he,B.isn't he C.must he.D.is he He must be ill,___he doesn’t come to school. He must be playing computer games at home,isn't he,为何用isn't he? he must ( )here.《be》 He must be happy! 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？ 几个英语句子,1.You must pay a_____ to your mistakes2.That's what he e_____ wants.3.My d____ life is very quiet but interesting.4.The litte girl to be t_____ of the dark,but now she isn't.5.If he is hopeless ,helping him is a w_____ of time.6.le He must be feel terrible,_____(反意疑问句）A.isn't he B.doesn't he C.mustn't he D.can't he he must be a writer ,__?A mustn't he B can't he C isn't he Dwasn't he Our teacher must be in his office,A mustn't he B can't he C isn't he D must He isn't at school .I think he ( )be ill.can,shall,must,has to ,原因. 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 1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be,don't have to,1.He ___ Mr.Black.He is taller.(用can't,can't be,must,must be,don't have to,needn't其中的一个填空,请说明一下选这个词的理由)2.You can _______ the teacher