单项选择题

A．in
B．at
C．with
D．on
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单项选择题
A．otherwiseB．howeverC．thoughD．whatever
A．otherwise
B．however
C．though
D．whatever
单项选择题
A．teachingB．examiningC．havingD．attending
A．teaching
B．examining
C．having
D．attending
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