单项选择题

It is not difficult to teach ______ students.

A．smart
B．fashionable
C．sensitive
D．vital
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单项选择题
The man was sent to prison for six months, ______ guilty of theft.
A．being found
B．having been found
C．having found
D．to have been found
单项选择题
______ his surprise, the manager found nobody in the meeting room.
A．At
B．To
C．For
D．With
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