A 1972 agreement between
reduced the amount of phosphates that municipalities had been allowed to dump into the
(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
dump 前面为什么要用had been这个时态?
1972年的协议的主要贡献就是减少了磷的排放量。
那是以什么为基数减少的呢?
是在这个协议之前的允许排放量基础上减少的,即1972年以前的排放量。
用had been没错。
用had been,新东方老师讲过
D是对的
这个题考的是一个定语从句,因此其从句的时态与主句谓语的没什么关系。我们既可以说 In1800, a pesent found a beautiful diamond that is the largest one in the world. 也可以说 In 1800, a pesent found a beautiful diamond that was the largest one in the world.
在A中,GMAT在没有明确的时间状语的情况下是不用过去和现在完成时的,而D中的一般现在时态表示站在reduce这个动作发生的时间角度上看的“现在时”,而不是发生在“reduce”之前的动作。
汗!不知道说清楚没有。
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