单项选择题

The window is broken. I think it really requires ______.

A．to repairing
B．to mending
C．repairing
D．mending
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单项选择题
Joseph is so brilliant that he always keeps some good ideas ______ his sleeve.
A．up
B．in
C．at
D．on
单项选择题
A．worked onB．worked atC．worked upD．worked out
A．worked on
B．worked at
C．worked up
D．worked out
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