单项选择题

I was looking forward to working __________ her expert guidance.

A．in
B．on
C．under
D．at
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单项选择题
He looked shocked, then burst __________ laughter.
A．to
B．in
C．upon
D．into
单项选择题
Employees can buy books __________ a discount.
A．for
B．of
C．at
D．in
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