题目内容：
Directions: In this section, There are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C) and D). 11.（）many times, he still couldn’t understand it.
A.Having told
B.He had been told
C.Though he had told
D.Having been told
参考答案：