求助大全2，和og不符

ursula_1

1.         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. D A

(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

为什么这题用had been allowed。我感觉og中有一题和这个一样，强调dump持续到现在应选C 啊？

有哪位大牛讲讲

AlienX

OG對, 是D

[此贴子已经被作者于2009-4-22 13:30:13编辑过]

ursula_1

大全怎么也会有错啊！不是误人子弟吗？都不敢做大全了！

AlienX

大全是人手打...所以會多點errors.