问题描述：
( ) the people have become masters of their own country ( ) science can really the people.
A .it is only then\that.B.it was that\when.C .it is only when \that.D.it was when\then.如何选,为什么?
A .it is only then\that.B.it was that\when.C .it is only when \that.D.it was when\then.如何选,为什么?
问题解答：
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