题目内容

______nature reserves _______us learn more about protecting animals.
A．Studying ; helpB．Studies ; helpsC．To study; helpingD．Studying; helps
D

试题分析：句意：研究自然保护区有助于我们了解更多的关于保护动物的知识。动名词做主语后面的谓语动词用单数形式；故选D。
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