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—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.

       A．a(chǎn); the                  B．the; the                C．the; a                  D．a(chǎn); 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

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

A. a; the

B. the; the

C. the; a

D. a; a