标题: 请教一道语法题 [打印本页] 作者: pausa1087 时间: 2010-2-23 23:01 标题: 请教一道语法题 1.A 1972 agreement between Canada and the United Statesreduced 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