Why haven't they finished this work yet?They are supposed _______ it by Friday evening.A.to finish B.having finished C.finished D.to have finished选哪一个

why haven't they seen each other lately? They've They haven’t -They didn't give the concert after all last night. -___________________________.A．Did they? Why not? B．Did they? Why didn’t? C．Haven’t they? Why? D．Didn’t they? Why not?答案是D haven't they 的翻译 they haven't slow down they haven’t packed their suitcast They haven't got any l they haven't any stationary什么意思 they haven't got to leave改错 they are very sad they haven’t got any honey 2)They must have arrived by now,haven't they?为什么是haven't they?谁帮我讲一下什么时候用didn’t 什么时候用haven’t they haven't decided where they would have a party(改为简单句)they haven't decided ( )( )have a party They haven't got any dictionaries____we needThey haven't got any dictionaries____we need. They haven't paid for their tickets,have they?-----_____.They didn't pay any money.A Yes,they have.B No,they haven't. They haven’t finished their workfinish 为什么没有还原? They havent yet 意思答准确有奖励 反意疑问句 They haven't gone home____? They haven't decided where to go.是什么从句?