ChaseDream»Forum › 下线版块 › GMAT语法专区 › 求助： OG-SC-#74

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

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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

求助： OG-SC-#74

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cx_ding

楼主

发表于 2009-11-24 14:53:04 | 显示全部楼层

我这样理解，请楼主和牛牛们指证：
过去完成时表达发生在过去的过去，并且在过去某一点已经结束。
从逻辑含义上说，这个文件签署以后，才减少了垃圾倾倒。
垃圾倾倒没有在过去的时间点结束，而是延续至今。

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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)