第二部分：英语知识运用（共两节，满分45分）
第一节：单项填空（共15小题；每小题1分，满分15分）
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。
例：It is generally considered unwise to give a child _______ he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B。
21. Paul had to write a history paper, _______ he couldn't find time to do it.
A. but B. so
C. because D. if
22. －Tom graduated from college at a very young age.
－Oh, he _______ have been a very smart boy then.
A. could B. should
C. might D. must
