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。