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【题目】Now all the e-bike riders in Ningbo________ (必须) wear helmets while riding.

【答案】must

【解析】

现在宁波所有的电动车骑行者在骑车时必须带头盔。

空格处后接动词原形wear,结合所给提示词,用情态动词must表示“必须”,所以空格处填must。故答案为must

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