单项选择题

A．not only
B．either
C．neither
D．both
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单项选择题
A．variableB．distinguishedC．variousD．isolated
A．variable
B．distinguished
C．various
D．isolated
单项选择题
A．neverthelessB．howeverC．thusD．maybe
A．nevertheless
B．however
C．thus
D．maybe
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