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
22. This book ________ 20 articles, ________ three written by his daughter.
A. contains, includes B. includes, containing
C. contains, including D. includes, contained
