题目内容:
How long did it actually take to build the Beijing-Zhangjiakou Railway?
A.Six years.
B.Five years.
C.Four years.
D.Three years.
参考答案:
How long did it actually take to build the Beijing-Zhangjiakou Railway?
A.Six years.
B.Five years.
C.Four years.
D.Three years.