there is no light in the dormory(宿舍).They must have gone to

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there is no light in the dormory(宿舍).They must have gone to the lecture,___?A.didn't they B.haven't they答案是B可是为什么啊

宿舍里没有灯光,他们必定是去听讲座了,不是吗?
这儿的反意疑问句中must have done 是表推测判断的,have作助动词,类似于do 的用法,故用haven't they.类比They cannot have gone to the lecture,have they?（否定的推测与判断）

There is no light in the dormitory.They must have gone to th The light is out in her room.she to bed A.must have gone B.h There is none here,they must have gone to school意疑问句是什么 The classroom is empty.They must have gone to the sports gro 高三英语单选题C22．There's no light on in the dormitory．They must ha the light is out in her room;she ()to bed.为什么括号中用must have g There is no water in the cup.I have no time.I'd like to have they must be at home -there's light _____ in the bedroom A t there is no limit to the ways in which they can be used to i there is no running away from the facts; they have __ up to There is no l__ in the building.We have to climb up to the 7 初中英语look!the light in the teacher's office is on .there must