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Every means _____________ prevent the water from ___________.

       A. is used to , polluting                              B. is used to, polluted

       C. are used to , being polluted                    D. is used to , being polluted

Every means ______ prevent the water from ______.

A. are used to; polluting                                          B. is used to; polluting

C. is used to; polluted                                             D. is used to; being polluted

Every means _____ prevent the water from _____.
A. are used to; polluting                                   B. will be used to; polluting
C. is used to; polluted                                      D. is used to; being polluted

Every means _____ prevent the water from _____.

Every means ______ prevent the water from ______.

Every means ______ prevent the water from ______.

         A．a(chǎn)re used to; polluting                 B．is used to; polluting

         C．is used to; polluted                     D．is used to; being polluted

Every means ______ prevent the water from ______.

       A．a(chǎn)re used to; polluting            B．is used to; polluting

       C．is used to; polluted                D．is used to; being polluted

Every means ______ prevent the water from ______.

A．a(chǎn)re used to; polluting                                  B．is used to; polluting

C．is used to; polluted                                     D．is used to; being polluted

Every means _____________ prevent the water from ___________．

A．is used to , polluting　　　　 B．is used to, polluted

C．a(chǎn)re used to , being polluted　 D．is used to , being polluted

Every means ________ prevent the water from ________.

[　　]

A．a(chǎn)re used to; being polluted

B．is used to; polluting

C．is used to; polluted

D．is used to; being polluted