21. In ________ old society many young women died by so strange and cruel ________ custom.
A. 不填；a B. 不填；the C. the；a D. an；a
22. “XiJinping's report,” a smile on his face, he continued, “_____ to several hot topics, discusses how to increase peasants' income.”
A. referring B. refers C. having referred D. referred
