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Thenpeoplebegantocdowntreesandbuildfactories.butnowthepollutionisgettingmores.Thenpeoplebegantoc___downtreesandbuildfactories.butnowthepollutionisgettingmores___.
题目内容：
Then people began to c down trees and build factories.but now the pollution is getting more s .
Then people began to c ___ down trees and build factories.
but now the pollution is getting more s___ .优质解答
cut
serious
Then people began to c ___ down trees and build factories.
but now the pollution is getting more s___ .
优质解答
serious
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