问题描述：
一道英语题目,求讲解 Xi'an is a city in the _____ of China
一道英语题目,求讲解
Xi'an is a city in the _____ of China
A.middle B.center C.front D.back
求讲解
一道英语题目,求讲解
Xi'an is a city in the _____ of China
A.middle B.center C.front D.back
求讲解
问题解答：
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