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It is recorded that in 1982 the weather became so cold that

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It is recorded that in 1982 the weather became so cold that the river froze over.
这里为什么用froze?不用has frozen或was freezing?
It is recorded that in 1982 the weather became so cold that
因为这里不需要强调 天气变冷 与 河水冰结 的先后顺序,只是单纯地描述1982年发生的事情,所以不用完成时.
之所以也不用 过去进行时,也是因为不是描述某个状态,而是叙述过去发生的事情.