问题
选择题
____________ 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
答案
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