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本贴相关题目 OG-2015-SC-77OG-2015-SC-77
OG-13-SC-77
OG-12-SC-74
... (DFTP)

00:00:00

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.

Areduced the amount of phosphates that municipalities had been allowed to dump
Breduced the phosphate amount that municipalities had been dumping
Creduces the phosphate amount municipalities have been allowed to dump
Dreduced the amount of phosphates that municipalities are allowed to dump
Ereduces the amount of phosphates allowed for dumping by municipalities

正确答案: D

og12 语法74题 have been allowed 和are allowed的区别

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avernus

楼主

发表于 2011-3-15 11:23:39 | 显示全部楼层

个人见解：

amount of phosphates that ....这句中已知that从句修饰amount
这里的amount应该可以有2种理解：
1.如OG上解释的，是现在的amount， that从句的内容只是表示amount的情况，而与前句的时态无关，用are allowed表示agreement仍然执行，或者用were allowed 表是agreement不再执行了
2.这个amount是与reduced发生同时的amount，即过去的amount，此时应用were allowed表示当时被agreement允许倾倒的量

2种理解应该都行，不过OG的解释看着别扭些

而had been allowed 不对是因为不能reduced 已经完成的事情（had been allowed）