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many times, he finally understood it. [ ]A. ToldB. TellingC. Having told D. Havi

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many times, he finally understood it. [ ]A. ToldB. TellingC. Having told D. Havi

_____ many times, he finally understood it.

[     ]

A. Told
B. Telling
C. Having told
D. Having been told

试题答案

D