单项选择题

It is said that this bridge has ______ for more than three centuries.

A．appeared
B．existed
C．risen
D．born
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单项选择题
No one will go out in the downpour, ______
A．will he
B．won't he
C．will they
D．won't they
单项选择题
The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.
A．which to base on
B．on which to base
C．to base on which
D．which to be based on
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