the last time Peter__to me was three days before he returnedA wrote B had written为什么不用B

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the last time Peter__to me was three days before he returnedA wrote B had written为什么不用B

the last time Peter__to me was three days before he returnedA wrote B had written为什么不用B
the last time Peter__to me was three days before he returned
A wrote B had written
为什么不用B

the last time Peter__to me was three days before he returnedA wrote B had written为什么不用B
皮特最后一次写信给我是在他回去的三天前
the last time Peter wrote to me 是主语
是说他最后一次写信给我,他写信给我这件事,而这件事已经发生了,所以用过去式.
不懂继续问