第一节 单项填空（共15小题；每小题1分，满分15分）
从每小题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
21. The doctor persuaded the patient _______ smoking.
A. give up B. to give up C. giving up D. gave up
22. It _________ that she has never been married.
A. turned up B. turned in C. turned out D. turned down
