问题描述：
Mary’s sister is a singer.she is two years than her.A\older;elder B\elder;elder C····
Mary’s sister is a singer.she is two years than her.
A\older;elder B\elder;elder C\elder;older D\older;older
Mary’s sister is a singer.she is two years than her.
A\older;elder B\elder;elder C\elder;older D\older;older
问题解答：
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