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. ---Severe laws must be made to fight against drunk driving.
--- ____________. It has cost so many lives these recent years.
A. All right B. Fine C. Unbelievable D. Exactly
22. The 5-month-old baby _________ had the doctor not been “stealing vegetables” in an online game and missed the opportunity to save the baby.
A. should not die B. should not have died
C. must not die D. must not have died
