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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
C
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