what do you think ----solve the problem

题目

what do you think ----solve the problem
A you can do
B you can do to
为什么不选A ,为什么要加TO
语法上加 TO 为什么

答案

to solve the problem 是动词不定式表目的.what do you think you can do你认为你能做什么to solve the problem来解决这个问题.这个do就是来迷惑你的～和后面不是一起的