Our school had about 20 notebook computers but only one-forth_____used regularly. Now we have 50 working all day long.  
     A. is                B. are                   C. was      D.were

【解析】D 考查主謂語(yǔ)的一致性原則和省略句式。依據(jù)one-forth （of the computers）可知。 

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