Question

____________ many times, but he still couldn’t understand it.

A. Though he had been told
B. Having been told
C. Having told
D. He had been told

Answer 1

答案D
本题考查句子结构和连词。因为后面有连词but，说明前面应该是一个句子。，因为BC两项都是非谓语动词短语，排除BC；而but又不能和though同时使用，故排除A