题干
—Peter, you didn't come to work this morning. What's wrong?
—Last night I worked until 1 o'clock. And ____ made me sick. The boss asked me to have a rest.
A：stayed up late
B：stay up late
C：staying up late
D：to stay up late
答案(点此获取答案解析）
C
③制定正确的经营战略 ④降低价格，赢得竞争优势
在点
处的切线方程为