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sam was taking his savings to the post office_______he lost

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sam was taking his savings to the post office_______he lost his wallet.
a when b,while c,as d,just as
when 不是表达某时刻,或一段时间的意思吗,这里为什么要选择when呢
都是错的,不懂别说,这是一个会时间状语从句,as和just as不用说,不可能填这里,时间状语从句的连词只能用when或while,when任何情况都可以,while前后必须都是过去进行时