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【题目】They must have known each other for a long time, __________?

A.have theyB.aren’t theyC.don’t theyD.haven’t they

【答案】D

【解析】

句意:他们彼此一定认识了很长时间了,是吗?

考查反意疑问句。have they是吗?aren’t they不是吗?don’t they不是吗?haven’t they不是吗?陈述句部分的谓语动词为must have known,表示推测过去的事情,反意疑问句应用haven’t they。故选D

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