---Thanks for your trouble. ---Not at all. I’m pleased to help you.
A. too much
B. too only
C. so much
D. only too
网友回答
A. too much
B. too only
C. so much
(答案→)D. only too
解析：only too 极为，非常 too eager / ready / glad / willing to do sth. 非常想干某事
The boy is too eager to get a geography book.