He had a pain _______ his back. A. on B. with C. in D. onto

He had a pain _______ his back. A. on B. with C. in D. onto

题目
He had a pain _______ his back. A. on B. with C. in D. onto
答案
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
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