og13-77求助

sunnycloris

OG13 P741 SC第77题

77. A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Greate Lakes.

(A) reduced the amount of phosphates that municipalities had been allowed to dump
(D)  reduced the amount of phosphates that municipalities are allowed to dump

正确答案是（D）。reduced应该用一般过去时，后面的had been allowed to dump应该也说得通阿，因为1972年的agreement规定了新的标准，这个标准比1972年之前要低，所以修饰过去的标准用过去完成时为什么不可以呢。

不是很理解为什么一定要用一般现在时

求助CDer们，多谢！

kiwifoodtown

这道题也是被问了无数遍了，municipalities are allowed to dump只修饰phosphates，阐述了一个基本事实：政府允许向湖里倾倒磷酸盐！这和时间无关，过去允许，现在也允许，将来也可能允许。
而reduced 只是对amount 起作用，和phosphates无关。所以这倒题是答案是D。

sunnycloris

kiwifoodtown 发表于 2013-8-6 09:35
这道题也是被问了无数遍了，municipalities are allowed to dump只修饰phosphates，阐述了一个基本事实：政 ...

谢谢了！刚开始看，CD论坛的问题有些没看到。多谢耐心回复

elhyee

kiwifoodtown 发表于 2013-8-6 09:35
这道题也是被问了无数遍了，municipalities are allowed to dump只修饰phosphates，阐述了一个基本事实：政 ...

这个是说，定语从句的时态和主句的时态无关。请问楼主这句话的依据是哪里啊？