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：考查分词做状语。本题中的动词tell与句子主语he构成逻辑上的被动关系，所以可以使用过去分词done或者having been done，这两者都表示被动和已经完成；having been done更强调已经完成。Done更强调被动。句意：已经被多次告知，他终于理解了这一点。故D正确。