but he still could not understand it.A. He had been told many timesB. Having been told m

问题补充：

,but he still could not understand it.

A. He had been told many times

B. Having been told many times

C. Told many times

D. Although he had been told many times

答案：

(答案→)A. He had been told many times

B. Having been told many times

C. Told many times

D. Although he had been told many times

解析：考查从句和非谓语动词。从该题中but一词看,前面应该是一个句子,而不是分词作状语。