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
What will probably happen to most illegitimate children
A．They will be kept by their fathers.
B．They will be kept by their grandparents.
C．They will be kept by their mothers.
D．They will be adopted by someone else.
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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