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. The incident turned him into different person, even if he did not realize it at beginning.
A. a; a B. the; the C. the; a D. a; the
22. The experiment shows that proper amounts of exercise, if regularly, can improve
our health.
A. being carried out B. carrying out
C. carried out D. to carry out
23. The Japanese suffering from the worst natural disasters .
