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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】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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