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

A. artistic B. enterprising

C. investigate D. optional

【答案】D

【解析】

試題分析：考查名詞。A. artistic藝術(shù)的; 有美感的；B. enterprising有進(jìn)取心的; 有事業(yè)心的；C. investigate調(diào)查；D. optional可選擇的，隨意的。句意：有適當(dāng)?shù)膭?dòng)機(jī)是不可選擇的(適當(dāng)?shù)膭?dòng)機(jī)不是可有可無(wú)的)——它是另一個(gè)取得成功的關(guān)鍵。故選D。

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