第二部分单项填空（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，并在答题卡上将该项涂黑。
21. There was ______ time ______ I hated to go to school.
A. a; that B. a; when C. the; that D. the; when
22. Nothing shall _______ me _________ from accomplishing my purpose.
A. hold , on B. hold , back C. hold , up D. hold , out
