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Large quantities of polluted water_____ into the sea so that lots of fish died.

A. is flowing   B. was flowing    C. are flowing     D. were flowing

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Large quantities of water ______and lots of fish died.

       A. has been polluted                   B. were polluted     

C. is polluted                        D. was polluted

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Large quantities of polluted water_____ into the sea so that lots of fish died.

A. is flowing   B. was flowing    C. are flowing     D. were flowing

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Large quantities of polluted water_____ into the sea so that lots of fish died.

A. is flowing   B. was flowing    C. are flowing     D. were flowing

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Large quantities of water ________ for cooling purpose in the only one of the plants that ________ steel in the city.

A．has been needed; produce

B．a(chǎn)re needed; produces

C．is needed; produces

D．have been needed；produce

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