单项选择题

Raising children, in the author's opinion, is ______.

A．a moral duty
B．a thankless job
C．a rewarding task
D．a source of inevitable pain
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A．monthB．dayC．yearD．century
A．month
B．day
C．year
D．century
单项选择题
A．forB．atC．toD．through
A．for
B．at
C．to
D．through
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