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
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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
单项选择题
A．Thanks toB．Owing toC．As a resultD．By way of
A．Thanks to
B．Owing to
C．As a result
D．By way of
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