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:英语知识运用 题类:单元测试 难易度:中档

    The scientist knows nothing about the matter, because he is always ______ himself in scientific study.
    A. burying     B. devoting     C. focusing    D. concentrating
  • 相关试卷