单项选择题

The unpleasant taste of the medicine prescribed by a famous doctor ______ in his mouth for hours.

A．rests
B．waited
C．prolonged
D．lingered
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单项选择题
At one time the Democratic Party was considered to be a party standing ______ state rights.
A．up for
B．by
C．out
D．back
单项选择题
Recently a number of eases have been reported of young children ______ a violent act previously seen on television.
A．duplicating
B．modifying
C．accelerating
D．stimulating
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