当前学科:公共课
  • 题目: 未知类型
    A new technique (), the yields as a whole increased by 20 per cent.

      A.working out

      B.having worked out

      C.having been worked out

      D.to have been worked out

    答案: <查看本题扣1积分>

    查看答案

    答案不对?请尝试站内搜索