Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether

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Gemerally,airisheavilypolluted_______therearefactories.A)whereB)whenC)ifD)whetherGemerally,airisheav

Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether
Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether

Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether
A)where 引导地点状从
一般来说,在有工厂的地方,空气受到了严重的污染.