This is the best way I have thought of the problem.A. that; solving B. in which; solving

问题补充：

This is the best way I have thought of the problem.

A. that; solving

B. in which; solving

C. which; to solve

D. /; to solve

答案：

A. that; solving

B. in which; solving

C. which; to solve

(答案→)D. /; to solve

解析：考察定语从句和特殊用法。定语从句I have thought of修饰先行词the best way，I前面省略了that.第二空是特殊用法：the way to do sth= the way of doing sth做某事的方法。故D正确。句意：这是我想起来的解决问题的最好方法。