Question

新概念 英语三的问题

after having been wounded towards the end of the war, he had been sent to hospital and was seperated from his unit。
meanwhile , his unit was lost and all records of him had been destroyed 。同一句子里边，为什么一会用过去时，一会用过去完成时呢》？
如何区分用法呢？

Answer 1

一般对于事情的叙述都是用过去时，如果是在所叙述的事情之前就已经发生过并且没有持续发生的事情，当然就用过去完成时咯。