paper作试卷的时候是可数名词,另外试卷是给很多学生（students)的不可能是一张,且 a piece of paper 是一张纸some pieces of paper 是很多张纸,所以用papers
the papers of the students是指学生的试卷,也就是说这试卷是出给学生们的,所以用of
Make the papers Make the papers
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