问题描述：
My sirster has ＿＿orange shirt.It is＿＿new shirt.A.a;a B.an;an C.a;
It is＿＿new shirt.
A.a;a B.an;an C.a;the D.an;a
It is＿＿new shirt.
A.a;a B.an;an C.a;the D.an;a
问题解答：
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