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-----Have you seen___ pen? I left it here this morning.

-----Is it __black one? I found it in the corner.

 A. a, the       B. the, the?    C. a, a       D. the, a

---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

-- Have you seen ______pen? I left it here this  morning
-- Is it ______black one? I think I saw it somewhere

-- 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．a；a             D．the；a

 ----Have you seen _____ pen? I left it here this morning.

----Is it ____ black one? I think I saw it somewhere.