. As the little boy had put every piece of waste paper in the rubbish bin, he could raise people's awareness of protecting the environment from a childhood. -(having)
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having put every piece of waste paper in the rubbish bin, the little boy could raise people's awareness of protecting the environment from a childhood.
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Having put every piece of waste paper in the rubbish bin, the little boy could raise people's awareness of protecting the environment from a childhood.
