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David got a higher grade in the final exam, for, you see, he made ________ mistakes.
A、few
B、fewer
C、little
D、less
【正确答案】：B
【题目解析】：根据David got a higher grade in the final exam，可判断后面用比较级，他犯的错误更少；因此B正确，less 修饰不可数名词。