2. 外语
  3. 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

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

admin2012-04-28  59
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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