---Thanks for your trouble.
---Not at all. I’m pleased to help you.
A. too much
B. too only
C. only too
D. so much
网友回答
A. too much
B. too only
(答案→)C. only too
D. so much
解析：only too 极为，非常 too eager / ready / glad / willing to do sth. 非常想干某事。根据句意选C。