单项选择题

A．was never
B．were never
C．have never been
D．has never been
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单项选择题
A．advanceB．in advanceC．advancedD．advancing
A．advance
B．in advance
C．advanced
D．advancing
单项选择题
A．is foundB．is to be foundC．be foundD．has been
A．is found
B．is to be found
C．be found
D．has been
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