This is a key to opening this door这句话有问题吗?This is a key to opening this door.还是This is a key to open this door.是哪个对?这里的to是当作介词还是不定式?

分类: 作业答案 • 2022-01-09 18:01:15

问题描述：

This is a key to opening this door这句话有问题吗?
This is a key to opening this door.
还是This is a key to open this door.
是哪个对?这里的to是当作介词还是不定式?

答