Thank you for the trouble that you had me with my studies.
A. helped
B. to help
C. helping
D. helps
网友回答
A. helped
B. to help
(答案→)C. helping
D. helps
解析：句中the trouble是先行词，you had helping me with my studies.是定语从句。定语从句补充完整为：you had the trouble （in）helping me with my studies.故选C。句意：谢谢你帮助我克服了学习上的麻烦。