he had a pain ___ his back空里用in 还是on?

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he had a pain ___ his back空里用in 还是on?
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he had a pain ___ his back空里用in 还是on?
he had a pain ___ his back
空里用in 还是on?

he had a pain ___ his back空里用in 还是on?
当然用in了,因为是身体的一部分
如果说He carried a bag on his back.背上背一个包.这是才能用on
看来真理掌握在少数人手中呀.

ON

用 on
凡是身上部位的都用on

he had a pain on his back
他背部有点疼

用in,例句: He has a pain in the knee. 他膝盖酸痛。