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. _____ smokes in this hall will be fined.
A. Who B. Whomever C. Anyone D. Whoever
2. _____ I will go to London for the 2012 Olympic Games hasn’t been decided.
A. Whether B. If C. What D. That
3. After _____ seemed like hours he came out with a bitter smile.
A. which B. it C. what D. that
