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  • 科目:英语
  • 题型:单选题
  • 难度:容易
  • 人气:1178

___the people have become the master of their own 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
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___thepeoplehavebecomethemaste