题目内容
The smog arrived in the Yangtze River Delta region on Nov．30，_________the air quality in 1 2 cities out of 25 was rated as severely polluted by Dec．1．
| A．where | B．when | C．which | D．what |
A
解析试题分析：句意：雾霾在11月30号到达长三角区域那里25个城市中有12个被列为严重污染。这里用了定语从句，先行词是the Yangtze River Delta region，定语从句中不缺主宾表，缺少的是地点状语，所以用where引导定语从句，选A。
考点：考查定语从句
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