练习册

  • 练习册
  • 试题
    141] The research is so designed that once nothing can be done to change it. [译文] 这个研究一旦开始什么都不能使它改变. A. begins B. having begun C. beginning D. begun [答案及简析] D. once begun是once引导的条件状语从句的省略形式.= Once it is begun 【查看更多】

     

    题目列表(包括答案和解析)


    同步练习册答案