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
Today, the Australian population is still mainly of British______.
A．descent
B．descend
C．decadence
D．descendant
单项选择题
A．mustB．mayC．shallD．will
A．must
B．may
C．shall
D．will
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