When a disaster occurs, all people, ________ they are old or young, rich or poor, try their best to help those in need.A.no matterB.whetherC.howeverD.even though
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B解析考查连词,根据后面的old or young ,和rich or poor,可知,该空选择whether,句意为,当一个遭难发生的时候,所有的人,无论年老还是年轻,富有还有贫穷,都会尽全力帮助有需要的人。