________the fuel in the market is from foreign countries，so we must make full use of it．A.Fourty percent ofB.Two-fifth ofC.Forty percent ofD.Second-fifths of
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C解析分析：A项拼法错，B项fifth要用复数，D项的分子错。forty percent(40%)＝two-fifths(延伸)分数和百分数后面可以带of短语，在句中作主语时，谓语动词是和of后面的名词保持一致关系，如是不可数名词，是单数(本题的fuel，后面动词用is)；如是可数名词复数，就是复数(124题中的books，动词是are written)；如是一个整体的名词(可数名词单数)，则是单数One-third of the apple is for me，and two-thirds of the apple is for you．