第二部分选择填空（共20小题；每小题1分，满分20分）21.

第二部分选择填空（共20小题；每小题1分，满分20分）
21.—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

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