2. 外语
  3. According to a study published by Dr. Myma Weissman, only one percent of Americans born before 1905 had suffered major depressio

According to a study published by Dr. Myma Weissman, only one percent of Americans born before 1905 had suffered major depressio

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问题 According to a study published by Dr. Myma 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.
选项 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
答案A
解析 由两个by时间短语，就可确定其对应修饰的动词均应用过去完成时，前面已提到，含by时间短语的句子要么用过去完成时，要么用一般将来时，此时，两个时间短语均为说话之前的时间，因而就只能用过去完成时。由此判定，仅A符合此要求，而B、C、D、E中的时态都是极其混乱的。
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