D 意思是我习惯了每天早起.
used to do sth./ be used to doing sth./ be used to do sth.的区别
1、 used to do sth.
used to 意为“过去常常”,表示过去的习惯、经常发生的动作或状态.如：
He used to be a teacher in our school.他曾经是我们学校的一位老师.
There used to be an old temple near the village.过去村子的附近有一座古庙.
2、 be used to doing sth.
be used to doing sth.表示“习惯于做某事”,其中to是介词,后接名词或动名词.如：
The old man and his wife have been used to living a simple life.这对老夫妇已经过惯了简朴的生活.
I am not used to my new job.我不习惯我的新工作.
Is she used to walking after supper?她习惯晚饭后散步吗?
be used to还可用get used to表示“渐渐习惯于……”.如：
You'll get used to your new job.你很快就会习惯新工作的.
3、 be used to do sth.
be used to do sth.表示“被用来做某事”.属于被动语态.如：
This computer is used to control all the machines.这台电脑是用来控制所有机器的.