单项选择题

It was Sunday. The trains were crowded. A gentleman was walking along the (1) looking into the windows and trying to find a place. In one of the (2) he saw a vacant seat. But a small suitcase was lying on (3) and a stout gentleman was sitting next to it. " Is this seat vacant" "No, it is my friend’s," (4) the stout gentleman. "He is coming. This is his suitcase.\

4（）

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