He had learnd such things, so he refused .
A. to do, being taught to
B. doing, to be taught to
C. to do, to be taught to
D. doing, being taught to
网友回答
A. to do, being taught to
B. doing, to be taught to
(答案→)C. to do, to be taught to
D. doing, being taught to
解析：learn 和refuse 都须用不定式作宾语,而不用动名词作宾语.