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【题目】Forty percent of students usually(exercise ) on the playground.

【答案】exercise
【解析】句意:有40%的学生经常在操场锻炼。exercise锻炼, 是一个动词。根据句意和句中的usually可知,这句话表示经常性的动作,应使用一般现在时态,主语是Forty percent of students,百分数修饰名词作主语的时候,谓语动词应跟名词一致,所以这里用复数,填动词的原形。

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