Wehave known each other since we were children．题目和参考答案——青夏教育精英家教网——

题目内容

19．Wehave known（know） each other since we were children．

分析自从我们是小孩时，我们就已经认识了．

解答答案：have known

点评答案：have known 现在完成时基本用法之一：表示过去已经开始，持续到现在，而且还可能继续下去的动作或状态，常与since或for引导的时间状语连用．结合句意，自从我们是小孩时，我们就已经认识了．根据since we were children．可知应该用现在完成时态．现在完成时态的构成：助动词have/has+过去分词，根据主语We是复数，所以应该用have，故填：have known．

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