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( ) the people have become masters of their own country ( )

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( ) 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?
选c,首先分析这个句子的含义,大概是“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”,你在really后面漏掉了一个类似serve的动词,那么据此判断when应该在第一个分句的前面,排除ab选项,然后是c跟d的选择,It is ... that ...是固定的强调句式,强调的是is之后的内容,即第一个分句,和句子的含义吻合,因此选c.