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。
21. For a long time they walked without saying ________ word. Jim was the first to break___________ silence.
A. the; a B. a; the C. a; / D. the; /
22. — Seems you are quite familiar with Russia.
— That is because I _________ the country in 1999.
A. have visited B. was visiting C. had visited D. visited
