标题: OG 13的 SC77，正确答案的句子结构不理解，求解释 [打印本页] 作者: christina1314 时间: 2012-8-18 00:20 标题: OG 13的 SC77，正确答案的句子结构不理解，求解释 77.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
答案是D，这样正确的句子就是：A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes. “that municipalities are allowed to dump into the Great Lakes”是做什么成分？ 定语从句？作者: jiaoguitar 时间: 2012-8-18 11:59
phosphates的同位语。作者: v20 时间: 2012-8-22 10:59
http://forum.chasedream.com/archiver/GMAT_SC/thread-530564-1.html
我还想问下 既然是对现在的影响为什么不用现在完成时呢??? 就是allow那里... have been allowed to dump 有什么不对么? 既然are allowed 为什么不能说是过去发生的事(agreement)对现在人的影响呢???