问题描述：
After having been wounded towards the end of the war,he had been sent to hospital and was separated from his unit.
have been wounded 完成时,
he had been sent 过去完成时,
was separated 一般过去时,
这三个时态用法是为什么,第一个为什么用完成时,而不有过完成时?
have been wounded 完成时,
he had been sent 过去完成时,
was separated 一般过去时,
这三个时态用法是为什么,第一个为什么用完成时,而不有过完成时?
问题解答：
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