问题 更新时间2023/4/3 12:59:00 The zoo keeper is worried because the number of visitors _____ smaller and smaller. A.become B.became C.is becoming D.have become 答案 登录 注册 参考答案:C 出自:联大 >> 河南城建学院-水文与水资源工程-英语 C(一)