单项选择题

There used to be a cherry tree in this field, ______

A．usedn't it
B．usen't it
C．didn't it there
D．usedn't there
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单项选择题
My uncle went to the police station to ______ the lost watch.
A．inquire
B．claim
C．demand
D．require
单项选择题
As a ______ president of the Fund, he closely followed its development long after his retirement.
A．former
B．formal
C．previous
D．late
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