You must stand in line when you're waiting for a bus.改为祈使句

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You must stand in line when you're waiting for a bus.改为祈使句

You must stand in line when you're waiting for a bus.改为祈使句
You must stand in line when you're waiting for a bus.改为祈使句

You must stand in line when you're waiting for a bus.改为祈使句
Stand in line while waiting for a bus