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）
从每题所给的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.They desired that they_______ the right to vote.
A. had B. have C. are D. were
22.__________ to sunlight for too much time will do harm to one's skin.
A. Exposed B. Having exposed
C. Being exposed D. After being exposed
