单个分数作主语时,谓语用单数还是复数? 如:The company has about 36computers,but only one-third ______ used regularly.用is 还是are? 分数、百分数后面有of结构谓语有空单数还是复数是取决于名词的单复数,但单个分数作主语谓语用单数还是复数?