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 context, the sentence But young actors with the stage in their blood are happy, at the end of the first paragraph means ______.
A．they don't care if their job is hard
B．they like the stage naturally
C．they are born happy
D．they are easily satisfied
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