---- 国语站 题库 2.77W 大中小设置文字大小 问题详情: ----________ do you volunteer in Old people’s Home? ----Once a week. We hope to help the old more. A. How soon B. How many C. How often D. How long【回答】C 知识点:相似 相近词比较题型:选择题 TAG标签:#