作业帮Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door.
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Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door.
Listen!I hear someone knocking at the door.
Listen!_____ ______ a knock on the door.
Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door.
Listen!_There is _ a knock on the door.