more than 70[ percents] of the students [percent]为什么加S percent可数吗

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more than 70[ percents] of the students [percent]为什么加S percent可数吗
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more than 70[ percents] of the students [percent]为什么加S percent可数吗
more than 70[ percents] of the students [percent]为什么加S percent可数吗

more than 70[ percents] of the students [percent]为什么加S percent可数吗
错了,percent不能加S,它不可数的.

不加s 加了就错了