【单选题】

Making a film takes a long time and is very hard work. Writing for the film may take many weeks. Filming the story being acted—or shooting the film, as it is called—often takes at least six months.Actors and camera-men work from very early in the morning until late at night.Each scene has to be acted and re-acted, filmed and re-filmed, until it is just right. Sometimes the same scene may have to be acted twenty or thirty times.

The film studio is like a large factory, and the indoor stages are very big indeeD、Scenery of all kinds is made in the studio: churches, houses, castles, and factories are all built of wood and cardboarD、Several hundred people work together to make one film. Some of these people are the actors and actresses. The director of the film, however, is the most important person in a film studio. He decides how the scenes should be filmed and how the actors should act.
Most people go to see a film because they know the film-stars in it. Sometimes the film may be very poor. It is best to choose a film made by a good director. Some famous directors make their films very real. People feel that they themselves are among the people in the film.
The scenes have to be filmed many times because ______.
A、it takes a long time to make a film
B．it is often difficult to make them just right
C．many people work together
D．the film is poor