It is only 　　　　 people know the importance of science 　　　　 science can really se

题干

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

上一题下一题 0.64难度单项选择更新时间:2010-11-06 11:29:19

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