三、单项选择（共10小题，每小题1分，共10分）
阅读下列各题，从每题所给出的A、B、C三个选项中，选出一个最佳选项，并把它的编号填在答题卷上。
( )21. She asked the secretary____ she could come or not.
A. if B. that C. whether
( )22. I don’t know____ I can get to the People’s Hospital.
A. where B. how C. that
( )23. As soon as he _____ his homework, he will call me.
A. will finish B. has finished C. . finishes
