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?
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