问下题选哪个,为什么?Generally,air will be heavily polluted ____ there

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问下题选哪个,为什么?Generally,air will be heavily polluted ____ there are a lot of factories.
A.where B.when C.that D.how

A
分析一下因果关系,排除C.D牛头不对马嘴.
A表示哪里有大量工厂哪里的空气受污染,B表示当出现大量工厂时空气（全部）受污染.由于前面有Generally对when略造成负面冲突,而且结合常识,A为佳.

问下题选哪个,为什么?Generally,air will be heavily polluted ____ there Gemerally,air is heavily polluted _______ there are factorie cities will be more polluted.and there will be f The water will be further polluted unless some measures ____ cities will be more polluted 和there will be more pollution的区 there ____ a picture show.will be 还是 is?为什么? Will there be a ____? cities will be more polluted.(对more polluted提问) ( If there are [ ]people driving, there will be [ ] air pollut there will be life while there is water and air there will be a strong ____ tomorrow . There will be ____ (大风) tonight.