单项选择题

The distinguished professor was invited to preside ______ the conference on behalf of the chairman.

A．on
B．in
C．over
D．for
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单项选择题
What is Taylor going to do
A．He is going to the West.
B．He is going to be ranked first.
C．He is going to the military academy.
D．He is going to the general.
单项选择题
______ is often the case with car accidents, most of the drivers involved have exceed the speed once too often.
A．This
B．It
C．As
D．Which
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