题目

将直线x－y－2 = 0绕其上一点逆时针方向旋转60°得直线l，则直线l的斜率为 A．                B．                 C．不存在            D．不确定 答案：CLet me take down ________ you’ve said ________ I forget.A. that, when B. what, beforeC. which, before D. what, when