问题

______ people have become masters of their country ____ science can really serve the people.
A:It is only then ;that
B:It is that;when
C:It is only when; that
D:It is when;when
B:It is that;when
C:It is only when; that
D:It is when;when
正确答案是:
同类题型
It’s said that the poor man died_____ the morning of January 12th.[ ]
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