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  3. They have not made any decisions on ________ they are going to deal with the problem of waste and pollution.

They have not made any decisions on ________ they are going to deal with the problem of waste and pollution.

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问题 They have not made any decisions on ________ they are going to deal with the problem of waste and pollution.
选项 A、that
B、which
C、if
D、how
答案D
解析 分析句子结构可知，空处引导的是一个宾语从句，作介词on的宾语，且从句中缺少方式状语，所以应用how引导。that在宾语从句中不充当任何语法成分，只起连接作用且无词义；which在宾语从句中作主语、宾语等成分，且有选择含义；if不可以引导介词后的宾语从句，这三项均不符合题意。故选D。
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