语法大全答案正确率高么？有og的原题怎么答案都不同呢？

reneezy

2.    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（A）
(E) reduces the amount of phosphates allowed for dumping by municipalities [A]
这题不是og的原题么，答案是D，怎么大全的答案是A

aeoluseros

语法大全很少错的，印象里好像就出现过一两个错误。这题确实比较难。

Since the dumping continued after the date of the agreement, the past perfect verb had been allowed
should instead be the present are allowed (if the agreement remained in effect when the sentence was written) or the past were allowed (if the agreement was no longer in effect when the sentence was written).