This is the best way _____ the river from _____ .
A.to prevent; being polluted | B.preventing; polluting |
C.preventing; being polluted | D.to prevent; polluting |
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This is the best way _____ the river from _____ .
A.to prevent; being polluted | B.preventing; polluting |
C.preventing; being polluted | D.to prevent; polluting |