单项选择题

A) made C) investigated
B) invented D) produced

A．made
B．invented
C．investigated
D．produced
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单项选择题
A) published C) admitted B) acknowledged D) established
A．published
B．admitted
C．acknowledged D) established
单项选择题
A) essentially C) needlessly B) substantially D) obviou~4y
A．essentially
B．needlessly
C．substantially D) obviou~4y
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