Sam was taking his savings to the post office ( )he lost his

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Sam was taking his savings to the post office ( )he lost his wallet 1.when 2.while 3.as 4.just as
请问选哪个,然后分别说出为什么对与错,

答案：A.
翻译：萨姆正带存款去邮局时,这时他把钱包丢了.
解释：
1. 此题考查when的一个特殊用法：when可以做并列连词,引导并列句,而不是做从属连词引导时间状语从句.
此时when = and then,翻译为“就在这时”.
此种用法要求前句2.必须为过去进行时或含有was/were about to do sth结构.
2. while引导时间状语从句时,要求从句的谓语动词必须是延续性动词,而lost his wallet为一个终止性动词,排除.
while引导并列句时,翻译为“与此同时/然而”,表示转折对比关系,不妥.
3. as和Just as同样引导时间状语从句,一般翻译成“一边...,一边...”/“正当...的时候”,要求前后两个动作同时进行,也不是并列句用法,排除.

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