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:模拟题 难易度:难

    The windows of our house ______once a week.
    A. must clean B. have cleaned C. is cleaned D. are cleaned
  • 相关试卷