问题描述：
he had lost his wallet while taking his savings to the post office 为什么用had lost his wallet
he had lost his wallet while taking his savings to the post office
为什么用had lost his wallet 他在去存钱时候,丢了钱包,过去完成时
不是要发生在动作之前吗?
he had lost his wallet while taking his savings to the post office
为什么用had lost his wallet 他在去存钱时候,丢了钱包,过去完成时
不是要发生在动作之前吗?
问题解答：
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