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【题目】Having proper motivation is not _______ it is another key to success.

A. artistic B. enterprising

C. investigate D. optional

【答案】D

【解析】

试题分析:考查名词。A. artistic艺术的; 有美感的;B. enterprising有进取心的; 有事业心的;C. investigate调查;D. optional可选择的,随意的。句意:有适当的动机是不可选择的(适当的动机不是可有可无的)——它是另一个取得成功的关键。故选D。

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