单项选择题

They are put to work when young, and they stay ______.

A．to
B．down
C．up
D．put
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单项选择题
She regretted ______ up the plan; otherwise, she would have made it.
A．given
B．to give
C．to have given
D．having given
单项选择题
A．knownB．definedC．calledD．referred to
A．known
B．defined
C．called
D．referred to
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