The way the problem sounds reasonable.
A. referred; to solve
B. referred to; solving
C. referred to; to solve
D. referring to; to solve
网友回答
A. referred; to solve
B. referred to; solving
(答案→)C. referred to; to solve
D. referring to; to solve
解析：第一空是过去分词做定语修饰the way，因为方法是被提到的，第二空填不定式做定语就是the way，句意是：被提到的解决问题的办法听起来很合理。选C。