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

【答案】must

【解析】

現(xiàn)在寧波所有的電動車騎行者在騎車時必須帶頭盔。

空格處后接動詞原形wear,結(jié)合所給提示詞,用情態(tài)動詞must表示“必須”,所以空格處填must。故答案為must。

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