many times，he finally understood itA. ToldB. TellingC. Having toldD. Having been told

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A. Told
B. Telling
C. Having told
(答案→)D. Having been told
解析：本题考查非谓语动词。句中He与tell构成被动关系，本题强调已经被多次告知，应该使用完成时。所以选择D。句意：被告诉了多次，他最终理解了。