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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!
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