A、before it is thrown away B、when it is thrown away C、after it is thrown away A关联句是第三段的：Factories must now clean their water bef

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问题

选项 A、before it is thrown away
B、when it is thrown away
C、after it is thrown away

答案A

解析关联句是第三段的：Factories must now clean their water before it is thrown away. 在污水被排放之前，工厂就应对其净化。

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