It is recorded that in 1982 the weather became so cold that the river froze over.
问题描述:
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?
答
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.