but he still could not understand it. A. Told many times B. Having been told many times

问题补充：

，but he still could not understand it.

A. Told many times

B. Having been told many times

C. He had been told many times

D. Though he had been told many times

答案：

A. Told many times

B. Having been told many times

(答案→)C. He had been told many times

D. Though he had been told many times

解析：考查前后主语保持一致。题中有连词but,故前后须是完整的句子。Though不能与but同时使用，故选C，句意：虽然他被告诉了许多次，但是他仍然不能理解。