题干
Jack always sleeps late on Sundays. I’m sure he ______when we get home.
A：is still sleeping
B：is to be slee
C：will still be sleeping
D：will be about to slee
答案(点此获取答案解析）
C
所用的时间为
，紧接着通过下一段位移
。则物体运动的加速度为( )