gemj和各位看看had的用法

深海的小美人鱼

2.    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
这题做对了，但是仍然有点恍惚。选择的时候在A和C中徘徊着。后来觉得A对。GEMJ可否给解释下。A中的两个had的用法。

深海的小美人鱼

4.    A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.
(A) A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients,
(B) A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle,
(C) A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients,
(D) The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that
(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,
这里我选了C，答案是E。 我觉得E改变了句意啊。因为A中说的是A substance derived from the Madagascar periwinkle。。。 has proved useful in decreasing 。而E说的是The Madagascar periwinkle， has proved useful in decreasing 。。。

shellyaaa

2.肯定是用过去完成时阿！不管是1905年还是1955年出生的人，都在1980年前已经得了忧郁病。

shellyaaa

4。谓语是is cultivated in China .....， 主语应该是The Madagascar periwinkle。

a derivative （of which ）has proved useful in decreasing mortality among young leukemia patients,
所以是derivative has proved useful

boyoo

-----可不可只写主要干绕选项，及真确大案，
-----并著明原题出处
这样可方便大家看落
那-------的长
那--小

cxj

Agree with Shellyaaa!

gemj

对不起小美，刚有时间来：

2.　中的两个HAD我想可能是以study published的日期为参照点吧，在这之前肯定都已经发生了。否则怎么知道呢？
确实在1980年前都发生的，但1980并没有作为参照点在题目中出现。

4。完全同意shellyaaa的精彩解释。

深海的小美人鱼

gemi，我对于你刚刚解释的大全4。。。那题，就是问just because....did not mean 那道
也是对于had的用法比较不确定。如果有了过去时间状语，不是不能用过去完成时吗？

gemj

以下是引用深海的小美人鱼在2003-12-17 1:56:00的发言：
gemi，我对于你刚刚解释的大全4。。。那题，就是问just because....did not mean 那道
也是对于had的用法比较不确定。如果有了过去时间状语，不是不能用过去完成时吗？

你说的是这个吧：
The fact that King Alfred had occupied and fortified London in 886 did not mean that he had also won the loyalty of its citizens: the invading Danes were well aware of this weakness and used it to their advantage in 893.
这里有两个HAD，你是说哪个？

[此贴子已经被作者于2003-12-17 2:10:17编辑过]

gemj

估计你是说：
King Alfred had occupied and fortified London in 886
我的理解是因为主句用的是过去时（did not mean），瞎猜，请高手研究一番，并指正。