单项选择题

They have done things they ought ______.

A．not to do
B．not to be done
C．not to have done
D．not having done
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单项选择题
His mother insisted that he ______ the coat when going out.
A．put on
B．puts on
C．to put
D．putting on
单项选择题
Don't risk ______ the job which so many people want.
A．losing
B．to lose
C．lost
D．your life to lose
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