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Thereisnolightorsoundinthehouse,Themusthavegonetothecinema,?Adidn'ttheyBhaven'tthey怎么不是A了?

题目详情
There is no light or sound in the house,The must have gone to the cinema,____?
A didn't they
B haven't they
怎么不是A了?
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答案和解析
There is no light or sound in the house,They must have gone to the cinema,____?
句中没有表示过去的时间状语
所以应该是 haven't they?
B吧