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

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

A.to solve

B.solving

C.to be solving

D.solves

答案及解析： A

解析：

A句意：这是我所想到的解决问题的最好的方法。干……的方法：the way to do/of doing sth….