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To prevent the air , something will have to be done A to pollute B to be pollute

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To prevent the air , something will have to be done A to pollute B to be pollute

  To prevent the air ______, something will have to be done

        A to pollute    B to be polluted     C from polluting    D from being polluted

试题答案

D

标签：somethingwillhaveairto

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