my mother looks a little o___________because she is too busy looking after us.

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• my mother looks a little o___________because she is too busy looking after us.
• my mother looks a little o___________because she is too busy looking after us.
• My mother is busy.She has too much workA to do B doing C do D does
• she is always there to listen中,is为什么不能去掉,求分析