问题
选择题
My sister is ____ now. She is in Class8, Grade7.[ ]
A. 13 old
B. 13 years
C. 13 years old
D. 13 year old
答案
答案：C
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My sister is ____ now. She is in Class8, Grade7.[ ]
A. 13 old
B. 13 years
C. 13 years old
D. 13 year old
答案：C