查人人中国名人网黄冈师范学院具体地址:小学英语填空
来源：百度文库 编辑：查人人中国名人网 时间：2024/05/10 11:28:22
So the man comes to the door.He knocks ______ the door.But there is no answer. He knocks at the door______. It is still quiet in the house.
at, again
at
again
So the man comes to the door.He knocks at the door.But there is no answer. He knocks at the door again. It is still quiet in the house.
第一个空：on,
第二个空：again
on/at,again
同上......
at,again