问题 更新时间2023/5/23 23:26:00 John.s father _________ mathematics in this school ever since he graduated from Harvard University. 单选题 (10 分) 10分 A.taught B.teaches C.has taught 答案 登录 注册 C. has taught 出自:国家开放大学 >> 国家开放大学人文英语4