单项选择题

After briefly ______ the history of the author, Prof. Li turtles to the novel itself immediately.

A．dipping in
B．dipping at
C．dipping into
D．dipping to
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All the communists ______ the people instead of being served by the people.
A．are supposed to serve
B．are opposed to serving
C．are subjected to serving
D．object to serving
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After ______ for the job, you will be required to take a language test.
A．being interviewed
B．interviewed
C．interviewing
D．having interviewed
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