They must have arrived by now,haven't they?为什么用haven't they?不用didn't they?by now 布什表示过去发生的吗

They must have finished their homework,_______. What must they do?They must have a hoilday.标What must they do?They must have a hoilday.标准译文是: When they put they must have When they put the tables inthey must have taken the controls out. They have a headache.用must改写句子 反义疑问句填空They must have come back,______? they must have confused me with my brother Rod they must have gotten complaint怎么翻译,说说语言点 They are wet all over.They _____ the rainA must have been caught inB must have been caught by (They must have been there yesterday ,______they?)能用weren't they 还是didn't they? they must do___duty,as we must do___.we have kept___promise;let them keep___. 请教what must they dowhat must they do?they must have tea这句翻译中文怎么说?难道是“他们必须做什么 他们必须喝茶” must have They must have stayed at hotel last night,____?A.mustn钬檛 they听听听 B. It must have been they who gave the signal.为什么是they而不是them呢? 英语翻译they all look so happy.they must have succeeded in persuading their teacher. They must have played computer games for several hours,didn't they?怎么改? 22.They kept trying _____ they must have known it was hopeless.为什么用WHEN? It must have been they who picked the flowers.这里的强调句的must have been 为什么用现在完成时?