作业帮Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/19 16:04:50
Listen!I hear someone knocking at the door.
Listen!_____ ______ a knock on the door.
Listen!_There is _ a knock on the door.
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来源：学生作业帮助网 编辑：作业帮 时间：2024/05/19 16:04:50
Listen!I hear someone knocking at the door.
Listen!_____ ______ a knock on the door.
Listen!_There is _ a knock on the door.