练习册

  • 练习册
  • 试题
    表示动作或状态从过去某个时刻开始一直延续到另一个过去时刻才完成.甚至还要继续下去.例如:At the age of ten,he had learned 500 English words.He had been ill for a week when we learned about it. 【查看更多】

     

    题目列表(包括答案和解析)


    同步练习册答案