单项选择题

A．that
B．which
C．what
D．of which
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单项选择题
A．was neverB．were neverC．have never beenD．has never been
A．was never
B．were never
C．have never been
D．has never been
单项选择题
A．advanceB．in advanceC．advancedD．advancing
A．advance
B．in advance
C．advanced
D．advancing
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