Thank you for the trouble that you had me with my studies.A. helped B. to helpC. helpingD.

问题补充：

Thank you for the trouble that you had me with my studies.

A. helped

B. to help

C. helping

D. helps

答案：

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。