练习册

  • 练习册
  • 试题
    10．Some people against toll boothsargue that roads, once ,should be free. A．building B．built C．having built D．being built 【查看更多】

     

    题目列表(包括答案和解析)

    Some people against toll booths (收费站) argue that roads, once ___________, should be free.

    　 A. building　 B. built　 C. having built　 D. being built

     

    查看答案和解析>>


    同步练习册答案