练习册

  • 练习册
  • 试题
    用来表示从过去某一时刻开始一直持续到现在的动作.例如:He has been doing the maths problems since 8:00./ It has been raining for two days. 【查看更多】

     

    题目列表(包括答案和解析)


    同步练习册答案