从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
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. a, a D. the, a.
22. —I’ve never found a better job and I’m so glad.
— _____.
A. I don’t think so B. Too bad.
C. Congratulations D. Don’t worry.
