【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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