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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．are needed; produces
C．is needed; produces
D．have been needed；produce
Large quantities of water ________ for cooling purpose in the only one of the plants which _________steel．
A．has been needed, produce
B．are needed, produces
C．is needed, produce
D．have been needed, produce