题干
--- Is there anything else to discuss?
--- No, that’s all, I guess. ____
--- No, that’s all, I guess. ____
A：What for?
B：Hurry up, will you?
C：Let’s call it a day, shall we?
D：How time flies!
答案(点此获取答案解析）
C
在点（1，1）处的切线方程为（ ）