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标题: 大全里关于时态的一点疑问O(∩_∩)O~ [打印本页]

作者: yahoochao 时间: 2010-5-4 10:08
标题: 大全里关于时态的一点疑问O(∩_∩)O~
41.According to a study published by Dr. Myrna Weissman, only one percent of Americans born before 1905 had suffered major depression by the age of seventy-five; of those born since 1955, six percent had become depressed by age twenty-four.

(A) only one percent of Americans born before 1905 had suffered major depression by the age of seventy-five; of those born since 1955, six percent had become depressed by age twenty-four

(B) only one percent of Americans born before 1905 suffer major depression by the age of seventy-five; if they are born since 1955, six percent become depressed by age twenty-four

(C) of Americans born before 1905, only one percent of them have suffered major depression by age seventy-five, but six percent of those born since 1955 do by the age of twenty-four

(D) major depression is suffered by the age of seventy-five by only one percent of Americans born before 1905, and by age twenty-four by the six percent born since 1955

(E)Americans born before 1905 suffer major depression by the age of seventy-five only one percent of the time, but six percent of those born since 1955 did so by age twenty-four

正确答案是A。我的疑问是题干中说到的信息是Dr.MW这个人的研究成果。既然是已经提出来的学术理论，那用过去完成时还对么？？

作者: yahoochao 时间: 2010-5-4 10:08
自己先顶顶啊O(∩_∩)O~

作者: venus2elva 时间: 2010-5-4 15:25
因为句子里用了published，所以suffer这个动作要在published之前完成，故用过去完成。

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