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. (A) reduced the amount of phosphates that municipalities had been allowed to dump (B) reduced the phosphate amount that municipalities had been dumping (C) reduces the phosphate amount municipalities have been allowed to dump (D) reduced the amount of phosphates that municipalities are allowed to dump (E) reduces the amount of phosphates allowed for dumping by municipalities 答案是D~不过我想请问的是 那个形容词子句的句意 看不太懂啊 为什麽前面加了一个MUNICIPALITIES? 感觉应该是 phosphate that are aloowed by municipalities to dump into.. 或者是 phosphate that municipalities allows to dump... 看不懂这里主词动词的成分 THX --

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