19. A 1972 agreement between LACE>CanadaLACE> and the LACE>United StatesLACE> reduced the amount of phosphates that municipalities had been allowed to dump into the LACE>Great LakesLACE>.
(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
为什么不选D啊？the amount of phosphates that municipalities are(had been) allowed to dump这不是政府法令的一部分吗，按XDF老师上课所讲，政府法令要用现在时的啊。 | 
