单项选择题

I ______ to work by bus but now I go to work on foot. ( )

A．used to going
B．used to go
C．am used to going
D．am used to go
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单项选择题
The conference was organized for all the ______ in the city ( )
A．mathematics teacher
B．mathematic teachers
C．mathematics teachers
D．mathematic's teachers
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