He should cut his hair(改为同义句）
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He should have his hair cut.
======以下答案可供参考======
供参考答案1:
have; cut have sth done 让某物被 done 表示用完成式，说明动作已经发生，而且是被动的。这是使役动词(have, make, let)的特有句型。 希望我的
供参考答案2:
His hair needs cutting.
供参考答案3:
He got to cut his hair.
供参考答案4:
He should have his hair cut.