标题: OG12 SC 74 （谁能给我解释下reduce allow dump 这三者的先后顺序） [打印本页] 作者: 小福娃欢欢 时间: 2011-5-11 05:35 标题: OG12 SC 74 （谁能给我解释下reduce allow dump 这三者的先后顺序） 各位大侠，请帮我解释下吧，实在弄不明白了。 A 1972 agreement between Canada and the United States reduced the amout of phosphates that municipalities had been allowed to dump into the Greak 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) reduced the phosphate amount municipalities have been allowed to dump
(D) reduced the amount of phosphates that municipalities are allowed to dump
(E) reduced the amount of phosphates allowed for dumping by municipalities
该题正确答案为D。 OG上的解释说：if the agreement remained in effect when the sentence was written,用 are allowed. 我有两个问题 1，allow这个动作的主语是什么。是agrement allow还是municipalities allow？ 如果说agrement allow, 那么OG 的解释是可以理解的。 同时 are allowed 这个时态表示这个agrement remained in effect when the sentence was written. 既然这个法律还有效，那么reduce 为什么要用过去时？reduce 的主语也是 agreement啊。 2，A选项中的reduced和had been allowed，我觉得反而好理解啊。因为在1972年之前，municipalities就allow了dump,所以 allow 用过去完成时啊。