【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】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)不是可有可無的)—它是另一個(gè)取得成功的關(guān)鍵。故選D。

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