There are ________ in each Microsoft Excel document for you to input in.A.three papersB.three paperC.three slices of paperD.three sheets of paper
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D解析paper是不可数名词,而papers表示“试卷”,所以A项不对。而我们通常用“a sheet of paper”表示“一页纸”,所以选项B不对,选项D正确,而slice意为“一片”,常修饰面包,如:a slice of bread.