There is no light in the dormitory.They must have gone to th

There is no light in the dormitory.They must have gone to the lecture_____
There is no light in the dormitory.They must have gone to the lecture,_____?
1.didn`t they
4.haven`t they
选4 为什么 1不可以啊?

掌上大明猪 1年前已收到3个回答举报

rock_1314 幼苗

共回答了24个问题采纳率：87.5% 举报

前句用现在完成时态,反意疑问句中也要用相同时态

1年前

梨过人幼苗

共回答了3个问题举报

= =楼上讲的完全正确、所以我貌似没神马好补充的- -

1年前

zz20 幼苗

共回答了5个问题举报

must 表推测时，反意疑问句应与must后的动词为准。但如果有过去时间，用didn't
It must have rained last night, didn't it?

1年前

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