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
The old lady has not yet______the death of her husband.
A．get rid of
B．get away with
C．get over
D．get across to
单项选择题
A turn in the road is not the end of the road______you fail to make the turn.
A．without
B．unless
C．because
D．so that
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