I stayed up late doing my homework yesterday,so I had trouble___up early this morning.

问题描述:

I stayed up late doing my homework yesterday,so I had trouble___up early this morning.
A.getting B.to get 为什么选A不选B?

句子的 doing 是现在分词(Present Participle)(又称-ing形式)
是固定用法.其他类似例子
SINGING well is not easy.
HAVING finished,he went home.
I enjoy EATING mango.