_______the people have become masters of their country _______ science can really serve the people.
A．It is only then; thatB．It was that; when
C．It is only when; thatD．It was when; then
C
It is ... that ...是強(qiáng)調(diào)句式，強(qiáng)調(diào)的是when引導(dǎo)的時(shí)間狀語(yǔ)從句。句意：只有當(dāng)人民成為自己國(guó)家的主人時(shí)，科學(xué)才能真正為人民服務(wù)
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