问题描述：
—Have you seen ________ pen?I left it here this morning.
—Is it _________ black one?I think I saw it somewhere.
A.a,the B.the,the C.the,a D.a,a
A为什么不可以?
—Is it _________ black one?I think I saw it somewhere.
A.a,the B.the,the C.the,a D.a,a
A为什么不可以?
问题解答：
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