单项选择题

A．needn’t have been taught
B．don’t need to be taught
C．must never have been taught
D．may never have been taught
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单项选择题
A．inefficiencyB．ineffectivenessC．inaccuracyD．inflow
A．inefficiency
B．ineffectiveness
C．inaccuracy
D．inflow
单项选择题
A．shut outB．show offC．stick toD．sign out
A．shut out
B．show off
C．stick to
D．sign out
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