单项选择题

A．might have learned
B．could have learned
C．has learned
D．learned
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单项选择题
A．namelyB．or ratherC．neverthelessD．still
A．namely
B．or rather
C．nevertheless
D．still
单项选择题
A．act uponB．act againstC．adhere byD．abide to
A．act upon
B．act against
C．adhere by
D．abide to
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