单项选择题


A．effectiver
B．effective
C．more effective
D．most effective
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单项选择题
A．foundB．inventedC．createdD．discovered
A．found
B．invented
C．created
D．discovered
单项选择题
A．inB．betweenC．amongD．middle
A．in
B．between
C．among
D．middle
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