It is only 　　　　 people know the importance of science 　　　　 science can really serve the pe

发布时间：2020-08-16 14:46:52

It is only 　　　　 people know the importance of science 　　　　 science can really serve the people.
A. that； when
B. when； that
C. then； that
D. that； then

网友回答

A. that； when
(答案→)B. when； that
C. then； that
D. that； then
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