从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. To our great surprise, the young man made a requirement that he _________ to Tibet.
A. sent B. was sent C. be sent D. would send
2. I guess you were in a hurry. You _______ your sweater inside out.
A. had worn B. wore C. are wearing D. were wearing
3. If you want to see a doctor, you fix a date with him ahead of time. This is a common _____ in the USA.
A. sense B. practice C. rule D. reality
