【題目】The earth is the only planet __________ provides us with everything we need. It’s our duty to protect it.

A. who B. what C. that

【答案】C

【解析】

句意：地球是唯一為我們提供所需物品的星球。 保護它是我們的責任。本句包含了一個定語從句，先行詞是planet“行星”，先行詞在定語從句中做主語，先行詞是物，可以選用that/which，選項A只能做先行詞是人的關系詞，選項B不能做定語從句的引導詞，故排除AB，先行詞有only修飾，只能使用that來做關系詞，故選C。

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