题干
—Please _______to return my book by Friday. I'll use it on Saturday.
—No, problem. I'll finish reading it on Thursday.
—No, problem. I'll finish reading it on Thursday.
A：don't forget
B：not to forget
C：not forget
D：forget not to
答案(点此获取答案解析）
A
到曲线
（其中参数
）上的点的最短距离为 （ ）
