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miaoyyooo

1.        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（A）

(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

为什么要用过去完成时态呢？不是很懂哦。求人解答丫～～

C的“but”为什么不行呢？不是两个句子也可以理解比较么？

laipiyu

is A the right answer?

by the age of seventy-five, 理解这个短语就明白了。by有“到。。。时”的含义，是一个过程。

这里没有转折的句义，不能用but，记得以前有过很多讨论，MM发贴前先搜一下，可以节约很多时间。

rwchinak

不同意楼上

句子的意思是说到了70岁才开始suffer，而不是suffer到70岁结束

用过去完成时是因为,那些人从70岁开始到这个study公布，都在suffer

但要用过去完成的话，只能假设这个study的公布是个过去时

A.正解

B.suffer现在时，错

C.
            of Americans born before 1905, only one percent of them have ....重复，错

D.及其wordy，看都不看，排除！十几个by表达混乱

E.改变句子意思，不是只有1％的时间suffer，是只有1％的人suffer

小伊YSY

诶，同问这道题，其实我觉得如果都变成一般过去时，可能会好得多吧？
完全不懂为什么会是过去完成……

等牛人……

小伊YSY

by the age of 难不成一定要用完成时？
这里不是表示一个时间点吗？

geegee

ｂｙ多少岁，从几岁开始，划了一道坎，来统计，应该用完成式，表示状态，表示结果；

Ｂ，ｂｅｃｏｍｅ，Ｃ，ｄｏ都不合适，Ｄ　ｍａｊｏｒ　ｄｅｐｒｅｓｓｉｏｎ作主语，也不合适，重点应该是人；Ｅ的语序更糟糕，ｓｕｆｆｅｒ的时态也不对。

这样看来也只有Ａ可以选择。