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【題目】The ability to make and use tools is one of the most basic characteristics of __________ it means to be human.

A. whether B. how

C. what D. when

【答案】C

【解析】

考查名詞性從句。

句意：制造和使用工具的能力是作為人類意味著什么的最基本的特征之一。分析句子結構可知，介詞of后面是賓語從句，從句中 means后面缺少賓語，用what引導。故選C。

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