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people have become masters of their country science can really serve the people．

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people have become masters of their country science can really serve the people．

_________ people have become masters of their country _________ science can really serve the people．

[]

A．It is only then ;that

B．It is that;when

C．It is only when; that

D．It is when;when

试题答案

答案：C

标签：countrytheircanscienceof

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