UC知道哪个句子是对的？谢谢
来源：百度知道 编辑：UC知道 时间：2024/09/28 17:49:19
某些书上有第一个句子，但做练习的时候选a good manner又不对1.Knocking at the door before entering a room is a good manner.
2.Knocking at the door before entering a room is good manners.
2.Knocking at the door before entering a room is good manners.
第2个句字的GOOD MANNERS是指“有礼貌”
的意思
2.Knocking at the door before entering a room is good manners.
2 good manners一般都用这个，懂礼貌的意思。很少见单数的用法。
He has good manners.
We need to learn good manners.
第二个