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50 percent of the students are in the classroom.提问50,how muc

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50 percent of the students are in the classroom.提问50,how much还是how many?将students改为milk呢
应该用How many
对百分数提问,要看OF后面那个名词是可数名词 还是不可数名词.student是一个可数名词,所以该用HOW MANY
同样的,由于MILK是一个u n(不可数名词),所以要用HOW MUCH