标题: 紧急求救一道过去完成时的题！！OG SC 77多谢！！ [打印本页] 作者: AresMa 时间: 2013-11-2 20:57 标题: 紧急求救一道过去完成时的题！！OG SC 77多谢！！ 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.
Areduced the amount of phosphates that municipalities had been allowed to dump
Breduced the phosphate amount that municipalities had been dumping
Creduces the phosphate amount municipalities have been allowed to dump
Dreduced the amount of phosphates that municipalities are allowed to dump
Ereduces the amount of phosphates allowed for dumping by municipalities
正确答案是D，我的疑问在A。
因为我在做的时候，把 the amount of phosphates想成是1972年以前的某一年规定的phosphates的排放量。翻译过来就是：1972年合约减少了之前规定的phosphates的排放量