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How old is her sister

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How old is her sister? A.It's ten years old. B.She's ten years old. C.She's ten years' old. D.She is ten year's old.
解题思路: 见解答过程
解题过程:
How old is her sister?
A.It's ten years old. B.She's ten years old.
C.She's ten years' old. D.She is ten year's old.
答案:B
解析:首先根据问句可知问的是 her sister,故答语应该使用主语she,years old是“....岁”的意思。故选B .
最终答案:略