What do you think solve the problem ?A. you can doB. can you doC. you can do toD. can you

问题补充：

What do you think solve the problem ?

A. you can do

B. can you do

C. you can do to

D. can you do to

答案：

A. you can do

B. can you do

(答案→)C. you can do to

D. can you do to

解析：句意：你认为你能做什么来解决问题？do you think是插入语，后面要用陈述语气，to do不定式做目的状语。故选C。