many times he finally understood it. A. ToldB. Telling C. 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

(答案→)D. Having been told

解析：考查非谓语动词。根据句意可知先被告诉许多次，故用现在分词的被动Having been told，表示动作先后性。句意：被告诉了许多次，他最终理解了。