问题描述：
travel为什么要变成travelling?People travelling on business can go to the Internet cafe and contact
People___on business can go to the Internet café and contact the office if they need to send a report or get information.这里为什么要用travelling?
People___on business can go to the Internet café and contact the office if they need to send a report or get information.这里为什么要用travelling?
问题解答：
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