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

问题补充：

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

答案：

A. It is only then; that 

B. It was that; when

(答案→)C. It is only when; that

D. It was when; then

解析：本题考查强调句型。被强调部分为状语从句only when the people...country；that为强调句型的引导词。

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