They spent 3 hours pianting the trees改为同义句
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Theyspent3hourspiantingthetrees改为同义句Theyspent3hourspiantingthetrees改为同义句Theyspent3hourspiantingthetr
They spent 3 hours pianting the trees改为同义句
They spent 3 hours pianting the trees改为同义句
They spent 3 hours pianting the trees改为同义句
It took them 3 hours to paint the trees
They have painted the trees for three hours.