Thezookeeperisworriedbecausethenumberofvisitors 国语站 题库 7.49K 大中小设置文字大小 问题详情:The zoo keeper is worried because the number of visitors ________ smaller and smaller.A.become B.becameC.is becoming D.have become【回答】C知识点:动词时态题型:选择题 TAG标签:#