职教组卷基于海量职教高考试题库建立的在线组卷及学习系统
职教组卷
  • 题型:选择题 题类:单元测试 难易度:中档

    Behind our classroom there are quite a few books on the shelf, and all of______ are useful to______.
    A. them; us B. they; we C. them; we D. they; us
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