25. It has been over a century _______ the railway was completed.(本题1.0分)
A、 when
B、 once
C、 which
D、 since

答案是:

标准答案:D
出自  青书学堂  >  漯河职业技术学院大学英语1(高起专)

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本题添加时间:2023/4/3 12:59:00