-Have you seen pen? I left it here this morning. -Is it black one? I think I aw
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—Have you seen________ pen? I left it here this morning.
—Is it________ black one? I think I aw it somewhere.
A. a; the B.the; the C.the; a D.a; a
试题答案
答案：D
解析：前者特指落下的那支笔，后者仅提问是不是一支黑色的
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