第二部分：英语知识运用(共两节，满分35分)
第一节：单项填空(共15小题；每小题1分，满分15分)
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. ________ growing number of teens are seeking cosmetic treatment for ________ variety of supposed physical shortcomings.
A. The; a B. A; the C. The; the D. A; a
22. He failed in the driving test again. He ________.
A. must have disappointed B. must have been disappointed
C. might be disappointed D. could have disappointed
23. The drunken driver is ________ for the traffic jam ________ yesterday.
A. to blame; occurred B. to blame; occurring
