请教大侠们一道《OG12版》与《白勇语法全解》有分歧的题！！

michaels7

最近准备语法时做到一题很困或：
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

OG12版的P671, 74题的答案解释为D, 但是白用语法全解的第四章 动词形式 的第三道习题，解释为A
我觉得A更为正确啊～～～麻烦大侠帮忙～～～～～

zhaoshj88

同问同问！我也选的A，怎么个意思呢`？？大虾快来帮忙解释一下吧~~~~~~~~~~~`

selinalover

其实我当时也纠结了很久 顶顶吧

vetch

manhattan论坛，如此解释，我觉得貌似说的通： It is nonsensical to believe that a past agreement could reduce the amount of phosphates that municipalities had been allowed to dump, since the dumping had already taken place. In other words, it is not possible to retroactively reduce the amount of dumping.

However, a similar sentence with a different meaning could definitely use the past perfect. For example, it would be grammatically proper to state A 1972 agreement between Canada and the United States fined the Canadians for the amount of phosphate that municipalities had dumped into the Great Lakes. . In this case, there are two distinct past events: the fine and the dumping. To indicate that the dumping preceded the fine, the past perfect is perfectly appropriate!

sacredgarden

我觉得从逻辑上讲，过去被允许的，已经成为历史了，不可改变了。要改变的，是将来的许可量。所以应该选D。

zhouyefantas

顶一个，期待牛牛来解决

michaels7

呵呵～～自顶一个～觉得三楼的解释有点道理～～～～～～仍期待权威来个了断呀～～吼～

yourkinki

正在纠结这道题
从中文意义上讲，过去的agreement的确可以减少现在的倾倒量，但是从语法上貌似不太符合常规
但是如果是had been allowed to dump的话~说明这些amount已经在agreement签订之前倾倒掉了~就更不可能reduce了。。。
期待高人解答。。。