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Sam was taking his savings to the post office ____he lost his wallet选项:1.when 2.while 3.as 4.just as选哪个,为什么?能否顺便说一下 when 及while的用法吗?

题目详情
Sam was taking his savings to the post office ____he lost his wallet
选项:1.when 2.while 3.as 4.just as
选哪个,为什么?
能否顺便说一下 when 及while的用法吗?
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答案和解析
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,这里应选When.