新概念英语2第45课选择题33）Sam was taking his saving to the post office____he lost his wallet.a)when b)while c)as d)just as 答案为什么选a）我说选d）也可以

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新概念英语2第45课选择题33）Sam was taking his saving to the post office____he lost his wallet.a)when b)while c)as d)just as 答案为什么选a）我说选d）也可以
新概念英语2第45课选择题3
3）Sam was taking his saving to the post office____he lost his wallet.
a)when b)while c)as d)just as
答案为什么选a）我说选d）也可以

新概念英语2第45课选择题33）Sam was taking his saving to the post office____he lost his wallet.a)when b)while c)as d)just as 答案为什么选a）我说选d）也可以
a.when,b.while,c.as 和 d.just as 都可以做连词,引导时间从句,表示“当……时”,本句只能选a.
在前半句是过去进行时,后半句是一般过去时的情况下,中间多用when,表示两个动作同时发生,“正当……时”,而后3个选择引导的时间从句大都是进行时态.

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