题目

 Only after he left his parents for work, ______ to realize how much they love them.        A. he began           B. did he begin      C. he had begun     D. had he begun 答案：中国古代主张“爱人”，要求统治者体察民情，爱惜民力的思想家是A．孔子 B．墨子C．庄子 D．韩非