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It was the serious water pollution that ____ the death of thousands of fishes.

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did they realize   will they realize   they did realize   were they realized  
serious problem    the more serious problems    most serious problems    the most serious problems  
accelerated    snatched    deleted    deposited  
have sent    have been sent    has been sent    has sent  
direct  gradual   fundamental  universal  
did they realize   will they realize   they did realize   were they realized  
rises    arises    raises    assesses  
did they realize    they did realize    had they realized    they had realized  
has offered    had been offered    have been offered    is offered  
the; the    the; a    不填; the    不填; a  
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live    to live    living    lived  
serious    distinctive    constant    positive  
of which    which    for which    where  

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