get up后面接时间的介词一般用at
例句
1、
We've got to get up early, all right?
我们得早起床,可以吧
2、
OK, Sleeping Beauty, time to get up.
好啦,睡美人,该起床了。
3、
I generally get up at six.
我一般六点钟起床。
4、
I tried to get up, but kept falling.
我试图站起身来,但每次尝试的结局都是再次摔倒在地。