问题描述：
Twenty people had already left .I knew that my turn had come.为什么不能说I know that my tuen had
Twenty people had already left .I knew that my turn had come.
为什么不能说I know that my tuen had come
是不是说前句是过去完成时 所以后句用过去时
Twenty people had already left .I knew that my turn had come.
为什么不能说I know that my tuen had come
是不是说前句是过去完成时 所以后句用过去时
问题解答：
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