many times he finally understood it.A. ToldB. TellingC. Having toldD. Having been told

问题补充：

many times , he finally understood it.

A. Told

B. Telling

C. Having told

D. Having been told

答案：

A. Told

B. Telling

C. Having told

D. Having been told

解析：

现在分词作状语，tell 这一动作发生在understand之前，且与主语he之间存在动宾关系。