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题库 / OG13-SC-77
A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes.
reduced the amount of phosphates that municipalities had been allowed to dump
reduced the phosphate amount that municipalities had been dumping
reduces the phosphate amount municipalities have been allowed to dump
reduced the amount of phosphates that municipalities are allowed to dump
reduces the amount of phosphates allowed for dumping by municipalities
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1.1972年 应用reduced 排除CE
2.the amount of phosphates + that从句 正确 排除BC
phosphate amount + that从句 错误
因为：that定从应就近修饰phosphate， 在phosphate amount + that从句中，定从修饰了amount不合逻辑，这里phosphate做amount的定语，不能再被that定从修饰。
3.B：缺少allow，改变句意
C：缺少that
E：应为allowed to do，且by municipalities改变句意，是municipalities被允许倾倒，不是被municipalities允许倾倒
4.时态解释见下
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