改错:We think it's impolite to go into his room without knocking at the door,don't we?

问题描述:

改错:We think it's impolite to go into his room without knocking at the door,don't we?

应该是isn't it
此时是指不敲门就进屋这件事不礼貌
而不是我们认为不礼貌