请教狒狒逻辑111题（关于逆否命题的一个疑问）

kikisunflower

111. The stated goal of the government’s funding program for the arts is to encourage the creation of works of artistic excellence. Senator Beton claims, however, that a government-funded artwork can never reflect the independent artistic conscience of the artist because artists, like anyone else who accepts financial support, will inevitably try to please those who control the distribution of that support. Senator Beton concludes that government funding of the arts not only is a burden on taxpayers but also cannot lead to the creation of works of true artistic excellence.
Which one of the following is an assumption on which Senator Beton’s argument is based?

(A) Most taxpayers have little or no interest in the creation of works of true artistic excellence.
(B) Government funding of the arts is more generous than other financial support most artists receive.
(C) Distribution of government funds for the arts is based on a broad agreement as to what constitutes artistic excellence.
(D) Once an artist has produced works of true artistic excellence, he or she will never accept government funding.
(E) A contemporary work of art that does not reflect the independent artistic conscience of the artist cannot be a work of true artistic excellence.

答案是E，也可以比较容易的选出来。

但是我发现，如果将D答案取非的话，就变成：
Once he or she accept government funding, the artist won’t produce works of true artistic excellence.
也就是说，一旦政府给了补贴基金，艺术家就没法创作出好的作品了。
这样一来，是不是说明D答案同样可以作为题目的假设。

如果D答案是错误的，是不是说明我把D的逆否命题写错了。
如果是错的，那么D正确的逆否命题是什么？

我最想问题的问题就是：
Once A, then never B 的逆否命题是怎么样的？

kikisunflower

恩恩，谢谢哇~我知道解这种题直接取非就可以了

只是不知道为虾米D的逆否命题，也就是D的等价命题，也正好可以作为原结论的假设……

不纠结了，forget about it....

sdcar2010

If a statement is correct, its contrapositive is always right.

When dealing with necessary assumption, you simply NEGATE an answer choice, not to find the contrapositive statement thereof.

kikisunflower

奥，不好意思，一楼打错了~
不是取非，是取逆否命题哈~

sdcar2010

Your negation was wrong.

(D) Once an artist has produced works of true artistic excellence, he or she will neveraccept government funding.

If you negate D, you have:
(D) Once an artist has produced works of true artistic excellence, he or she WILL accept government funding.

kikisunflower

自己顶哈子~