练习册

  • 练习册
  • 试题
    The problem is too complex. We ought to a specialist. A. call on B. call at C. call for D. call in 【查看更多】

     

    题目列表(包括答案和解析)

    The problem is too complex. We ought to _______ a specialist.

    A. call on       B. call at         C. call for             D. call in

    查看答案和解析>>


    同步练习册答案