第一节：单项填空(共15小题，每小题1分，满分15分)
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的标号涂黑。
21．As soon as concert film “This Is It” was released on October 28th , it became
great success in all big cinemas across the planet.
A．a; the B．the; a C．the;不填 D．a; a