问题
选择题
My brother has a ______ son. [ ]
A. four-years-old
B. fourth-year-old
C. four-year-old
D. four-year-olds
答案
答案：C
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My brother has a ______ son. [ ]
A. four-years-old
B. fourth-year-old
C. four-year-old
D. four-year-olds
答案：C