og11-62

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 dumpling

(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

为什么是d呢？现在时态解释的不清楚啊。大家帮我解释一下好么？谢谢

呵呵 发现我们的注册时间是挨着的

我认为这题的关键在that引导的定语丛句是修谁的，是the amount of phosphates 还是 phosphates  若前者则为(A)，若修后者则答案为(D)，

希望在讨论，又没有必要给他们写封信问问，以前由人这样做过。

此题在白勇Page84

答案是A

关于D的解释是时态不协调