单项选择题

You had better ________ a doctor as soon as possible.

A．seeing
B．saw
C．see
D．seen
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单项选择题
Every means _______ been tried to solve the difficult problem.
A．have
B．has
C．is
D．are
单项选择题
The explorers sailed on the ocean for two weeks and ________ found the mysterious land.
A．generally
B．eventually
C．extremely
D．gradually
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