he had a pain

网友回答

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.
======以下答案可供参考======
供参考答案1:
ON供参考答案2:
用 on 凡是身上部位的都用on
供参考答案3:
he had a pain on his back
他背部有点疼
供参考答案4:
用in，例句： He has a pain in the knee. 他膝盖酸痛。