62. 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into 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
答案怎么选出来的已经知道了,只是如果谓语动词如果不是reduced而是banned的话是不是用过去完成时就行了?
[此贴子已经被作者于2009/7/18 9:30:25编辑过] |