The recommendation he gave me is that I more traveling to open my eyes.A. will doB. could

问题补充：

The recommendation he gave me is that I more traveling to open my eyes.

A. will do

B. could do

C. should do

D. must do

答案：

A. will do

B. could do

(答案→)C. should do

D. must do

解析：考查虚拟语气。句意：他给我的建议是我应该做更多的旅行开拓眼界。在recommendation等表示建议的词语的从句一般要用虚拟语气，should表示推测建议等含义，故选C。