i knew that my turn had come.这是新概念二上面的一句话,为什么用had+动词原型这个用法?

i knew that my turn had come.这是新概念二上面的一句话,为什么用had+动词原型这个用法? I knew that my turn had come为什么用knew I knew that my turn had come. knew that my turn had come I knew that my turn had come.这句话怎样理解 Twenty people had already left .I knew that my turn had come I knew that my turn had come我知道这次该轮到我了!my turn是什么意识 i kenw that my turn had come为什么不用had to ? 这个英语句子真不懂?这是新概念 二 的练习题,这里说； I have already had lunch.have yo I've already had lunch.Have you had lunch yet?这是新概念二第4课的课后练习 新概念的一句话they had just discovered that a prisoner had escaped. if only i had knew that at that moment