问题
选择题
The city has 70-year history. [ ]
A. 70 year history
B. 70 years history
C. 70 year's history
D. 70 years' history
答案
答案：D
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The city has 70-year history. [ ]
A. 70 year history
B. 70 years history
C. 70 year's history
D. 70 years' history
答案：D