◎ 题干
—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
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“—Mike doesn't look happy. What's wrong with him?—It seems that he has some trouble ______ that problem. [ ]A. solve B. solves C. solvingD. to solve…”主要考查了你对  【动名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。