I knocked ---------a glass door because I thought there was no door at all

问题描述:

I knocked ---------a glass door because I thought there was no door at all
I knocked ---------a glass door because I thought there was no door at all
A onto B into C at
这些选项有什么区别啊?

B,我一头撞上玻璃门,因为我以为那里没有门
hnock at表示敲门