用单词适当形式填空 The little boy is ____( exercise)

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用单词适当形式填空 The little boy is ____( exercise)
用单词适当形式填空 The little boy is ____( exercise)

用单词适当形式填空 The little boy is ____( exercise)
The little boy is( exercising).这位小男孩正在训练(锻炼)

doing exercise

exercising