问题描述：
这句话中的that引导的是什么从句,修饰什么的?
Once on a dark winter's day,when the yellow fog hung so thick and heavy in the streets of London that the shop windows blazed with gas as they do at night,.
Once on a dark winter's day,when the yellow fog hung so thick and heavy in the streets of London that the shop windows blazed with gas as they do at night,.
问题解答：
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