请认真阅读下面各题,从题中所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。
21. It is reported that China is developing _____ emergency plan to solve ____ traffic jam crisis in Beijing.
A. the; the B. an; / C. an; the D. /; the
22. ---Hello, John, how are you? Are you busy now?
---Not really. I ____ my report. And now I am watching an American movie on TV.
A. finished B. have finished C. had finished D. have been finishing
23. The zoo worker told the visitors that in the case of a highly _____ animal, performance training is easy and not so painstaking.
A. intelligent B. interactive C. internal D. initial
