问题
选择题
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
答案
答案：B
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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
答案：B