问题描述：
关于while的英语题
He held the food in his left hand_____he played with his right hand.
为什么填 while while后面不是要跟动词+ing吗?
He held the food in his left hand_____he played with his right hand.
为什么填 while while后面不是要跟动词+ing吗?
问题解答：
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