题目内容

_______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 ...是强调句式，强调的是when引导的时间状语从句。句意：只有当人民成为自己国家的主人时，科学才能真正为人民服务
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