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

A．It is only then; that	B．It was that; when
C．It is only when; that	D．It was when; then

It is ... that ...是強調句式，強調的是when引導的時間狀語從句。句意：只有當人民成為自己國家的主人時，科學才能真正為人民服務

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