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:本题考查非谓语的用法。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。
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