[文法] 逗号问题

楼主: ronan001 ("宅"猫)   2018-06-07 21:56:24
Our manager instructed us that the current room rate would be quotable only un
til the end of month, when a rate increase would go into effect.
请问为什么这句话在when前面要加逗号呢?
这个副词子句算是从属子句还是补充句?
谢谢
作者: kaifrankwind (大师兄)   2018-06-07 22:42:00
前面主要子句太长,喘口气用的

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