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
______ more sunlight, these vegetable plants grow much better this year.
A．To receive
B．Having received
C．Receiving
D．Since receiving
单项选择题
______ the sun in superstitious awe everywhere in the world.
A．Man has long held
B．Long has held man
C．Has man long held
D．Man has held long
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