II.单项填空（共10小题；满分15分）从A、B、C、D四个选项中，选出最佳选项。
21. The student ______ we saw just now is the best runner in our school.
A. where B. what C. whom D. which
【解析】
22. The club ______ members are music fans meet in the school garden every Saturday afternoon.
A. who B. whose C. which D. that
23. I don’t know the reason ______ the house is so dirty.
A. why B. what C. where D. how
24. They set off at 9 a.m. and ______ the airport an hour later.
A. had reached B. have reached C. would reach D. reach
