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【题目】It’s our duty to do something to __________ (保护) the environment around us.

【答案】protect

【解析】

句意:做点事来保护我们周围的环境是我们的责任。

考查不定式,根据观察句意可知这里后面的to是不定式来表示目的,不定式后面接动词原形,所以这里to后面的动词要用其原形,又根据后面的中文意思提示可知这里应该填入protect,故答案为protect

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