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求原因,
选C:首先区别时态,排除B,然后判断单复数,因为单复数的确定要看分数后面跟的主体.例如:可数名词:Three fifths of the computers on display were home-made.展出的电脑五分之三是国内生产的.不可数名词:About one third of one's time is spent in sleep.大约三分之一的时间用于睡眠.USA为单数,所以选C