问题
Mr. Hu, can you tell us how to learn swimming well—Sure. But remember we can learn nothing well _______ hard work.
A:a worse, as good as
B:a better, better than
C:a more important, not as good as
D:a cheaper, as good as;
B:a better, better than
C:a more important, not as good as
D:a cheaper, as good as;
正确答案是：
