单项选择题

A．what they meant
B．they are meant to
C．that they meant
D．which they meant
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单项选择题
A．needn’t have been taughtB．don’t need to be taughtC．must never have been taughtD．may never have been taught
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
单项选择题
A．inefficiencyB．ineffectivenessC．inaccuracyD．inflow
A．inefficiency
B．ineffectiveness
C．inaccuracy
D．inflow
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