They talked as if they (know) ______ each other for a long time.

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问题 They talked as if they (know) ______ each other for a long time.

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答案had known

解析 本句关键在于掌握as if的用法。当as if后面引导的从句中描述的情况与事实情况不相符时,需要用虚拟语气,如果表示与现在情况相反,谓语动词用过去时构成虚拟;表示与过去情况相反时,用过去完成时构成虚拟。本句与过去事实情况相反,所以谓语动词使用过去完成时。
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