问题补充：
–Do you have some trouble the problem? Do you need some help?
--No, thank you. I can make it myself.
A. solve
B. solving
C. to solve
D. solved
答案：
A. solve
(答案→)B. solving
C. to solve
D. solved
解析：have some trouble in doing sth，表示在做某些事方面有困难，故选答案为B
