问题描述：
Mary's____brother is a doctor.He is four years______than her.
A.older;elder B.elder;elder
C.elder;ilder D.older;older
谁能讲讲为什么?
A.older;elder B.elder;elder
C.elder;ilder D.older;older
谁能讲讲为什么?
问题解答：
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