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【题目】Is very important that people protect plants and animals?

A. they B. he C. there D. it

【答案】D

【解析】句意:人们保护植物和动物很重要吗?考查it句型本句是“It’s+形容词+that从句”结构,that从句(还有不定式和动名词)是句子的真正主语,为了避免“头重脚轻”,用it做形式主语,把真正的主语放在后面。根据句意结构,可知选D。

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