单项选择题

The phrase "once in a blue moon" in last line refers to ______.

A．all at once
B．once for a long time
C．once in a while
D．once and for all
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单项选择题
According to the passage, the main reason why young people should be discouraged from becoming actors is ______.
A．actors are very unusual people
B．the course at the drama school lasts two years
C．acting is really a hard job
D．there are already too many actors
单项选择题
An assistant stage manager's job is difficult because he has to ______.
A．do all kinds of stage work
B．work for long hours
C．wait for a better company
D．act well
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