—Mike doesn't look happy. What's wrong with him?—It seems that he has some trouble ______

题目简介

—Mike doesn't look happy. What's wrong with him?—It seems that he has some trouble ______

题目详情

—Mike doesn't look happy. What's wrong with him?
—It seems that he has some trouble ______ that problem.
[     ]
A. solve  
B. solves  
C. solving    
D. to solve
题型:单选题难度:中档来源:同步题

答案

C

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