大全987-41

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

完全晕了啊，请高人指点啊~

偶觉得没有必要用被动吧~~D中major depression is suffered by the age of seventy-five by only one percent 和后半句全是两个大被动，使句子十分长啊~~而且后半句有since却没有用have的形式，是不是不大对呢~~虽然A前半句用了have似乎别扭，但后半句还不错

个人意见~~本人第一次帮人答题~~不对请指正