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题目内容
(漯河职业技术学院大学英语1(高起专))
25. (单选题) It has been over a century _______ the railway was completed.(本题1.0分)
A、 when
B、 once
C、 which
D、 since
A、 when
B、 once
C、 which
D、 since
参考答案