从A、B、C、D、四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项涂黑。
21．(2012•潍坊期末)If you are hunting________chance to improve yourself in English，I think the English corner will be________smart choice.
A．a；a B．a；the
C．the；a D．the；the
22．(2012•自贡二诊) It was shortly after that serious accident ha
