单项选择题

Directions:
In this part there are ten incomplete sentences, each with four suggested answers. Choose the one that you think is the best answer. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar across the corresponding letter in the brackets.
She was complaining that the doctor was ______too much for the treatment he was giving her.

A.expending
B.offering
C.costing
D.charging