求教SC大全里面的题

moremildseven

额 987第2题 答案怎么和OG上的不一样 OG上选D
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.
(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


这个时态要不要这么纠结啊 个人倾向选A

moremildseven

可是如果理解成 是以前allow的amout减少了呢