Not until the press reported the pollution _________ why the water supply had been cut off.
#81622
A
people did know
B
people had known
C
did people know
D
had people known
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 So _____ that modern industry cannot develop without it.
#83383
A
electricity is important
B
important is electricity
C
electricity important is
D
important electricity is
      that he was praised by his teachers.
#81482
A
So great progress had he made
B
So great progress he had made
C
Such a great progress had he made
D
Such great progress had he made