[求助] 大全10-13，if条件从句怎么取非？

sandrachen

13. Exports of United States wood pulp will rise considerably during this year. The reason for the rise is that the falling value of the dollar will make it cheaper for paper manufacturers in Japan and Western Europe to buy American wood pulp than to get it from any other source.

Which of the following is an assumption made in drawing the conclusion above?

(A) Factory output of paper products in Japan and Western Europe will increase sharply during this year.

(B) The quality of the wood pulp produced in the United States would be adequate for the purposes of Japanese and Western European paper manufacturers.

(C) Paper manufacturers in Japan and Western Europe would prefer to use wood pulp produced in the United States if cost were not a factor.

(D) Demand for paper products made in Japan and Western Europe will not increase sharply during this year.

(E) Production of wood pulp by United States companies will not increase sharply during this year.

这道题目选C为什么不可以呢？ Assumption的题目对选项取反可以削弱结论，如果对C选项取反，是对If的条件取反吗？

请各位NN解答一下，谢谢！

yunerfeifei

同问