— Have you seen______ pen? I left one here this morning.
— Is it___________ black one? I think I saw it somewhere.

A．the; the

B．a; a

C．the; a

D．a; the

— Have you seen______ pen? I left one here this morning.

— Is it___________ black one? I think I saw it somewhere.

A. the; the             B. a; a               C. the; a        D. a; the

 

— Have you seen______ pen? I left one here this morning.

— Is it___________ black one? I think I saw it somewhere.

A. the; the             B. a; a               C. the; a        D. a; the

 

— Have you seen______ pen? I left one here this morning.

— Is it___________ black one? I think I saw it somewhere.

A. the; the             B. a; a               C. the; a        D. a; the

 

— Have you seen______ pen? I left one here this morning.

— Is it___________ black one? I think I saw it somewhere.

A. the; the             B. a; a               C. the; a        D. a; the