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thereisaveryvaluablelessoninwhatwewerejustwith.用through还是over.答案是第一个,为什么over不可以

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there is a very valuable lesson in what we were just ___ with.用through还是over.答案是第一个,为什么over不可以
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There is a very valuable lesson in what we were just ___ with.用through还是over.答案是第一个,为什么over不可以?
因为be through with的意思是:“已结束;洗手不干”,是一个固定词组.