问题 更新时间2023/12/8 16:21:00 — Has Jack finished his homework yet? —I have no idea; he ____ it this morning.(2.5分)A: was doingB: had been doingC: has doneD: did 答案 登录 注册 A 出自:梦想在线 >> 武汉科技大学大学英语2