大全－３３

lenghongmin

请教：大全－３３

33.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,

答案选Ｅ
实在不明白为什么Ｃ错呢

xiaotangyu

C项这个 Madagascar periwinkle derivative有定语修饰，所以不可以用a 应该用the表示特指

lenghongmin

哦，原来是这样啊，太感谢拉

lingshihong

但是我觉得E的意思不一样了~原文是说一个来自于MP的东西，现在直接是MP做主语了~~语义改变了啊~

xiaotangyu

(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,

不是啊 你看E项还是在说a derivative啊 并没有改变重心