问题补充:
there are a large number of chemical factories,the air is likely to be polluted.
A. That
B. Where
C. Once
D. As
答案:
A. That
(答案→)B. Where
C. Once
D. As
解析:where引导地点状语从句。句意:在有大量化工厂的地方,空气就很可能被污染。
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