问题
选择题
They have worked in this city for .[ ]
A. two year and a half
B. two and a half year
C. two years and half a
D. two and a half years
答案
答案：D
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They have worked in this city for .[ ]
A. two year and a half
B. two and a half year
C. two years and half a
D. two and a half years
答案：D