练习册

  • 练习册
  • 试题
    Gunpowder is generally believed in ancient China. A. to have invented B. being invented C. to have been invented D. having invented 【查看更多】

     

    题目列表(包括答案和解析)

    Gunpowder is generally believed __________ in ancient China.

    A．to have invented

    B．being invented

    C．to have been invented

    D．having invented

     

    查看答案和解析>>


    同步练习册答案