________ many times, he finally understood it.
A. Told B. Telling C. Having told D. Having been told
________ many times, he finally understood it.
A. Told B. Telling C. Having told D. Having been told
D
考查非谓语的用法。tell与主语之间的关系是被动和完成的关系，所以用having been done来表示被动和完成。