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标题: 求助OG第74题 [打印本页]

作者: meckychen    时间: 2009-11-19 15:50
标题: 求助OG第74题
A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes.

请问为什么要用现在是are allowed ?
作者: sayysong    时间: 2009-11-19 16:10
这个美加两国间的1972协议内容(the amount of phosphates that municipalities are allowed to dump into the Great Lakes)直至今日还在生效,虽然它的效果是已经发生了的(reduced)。




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