A.How they finished
B.How did they finished
C.That how they finished
D.That how did they finished
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A.6%
B.8%
C.10%
D.12%
A.Class A
B.Class B
C.Class C
D.Class D
A.class A
B.Class B
C.Class C
D.Class D
A.Class A
B.Class B
C.Class C
D.Class D
A.Class A
B.Class B
C.Class C
D.Class D
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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