【題目】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:他們彼此一定認識了很長時間了,是嗎?

考查反意疑問句。have they是嗎?aren’t they不是嗎?don’t they不是嗎?haven’t they不是嗎?陳述句部分的謂語動詞為must have known,表示推測過去的事情,反意疑問句應用haven’t they。故選D。

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