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题目
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?

提问时间:2020-10-16

答案
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.
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