【題目】Failure often occurs in our life. Keep ______ about the future, and you will achieve the goal you set sooner or later.

A. thankful B. skeptical

C. optimistic D. successful

【答案】C

【解析】A. thankful感謝的； B. sceptical懷疑的； C. optimistic樂觀的； D. successful成功的；根據(jù)題意：失敗在生活中經(jīng)常發(fā)生，所以應(yīng)該樂觀的對待。選C。

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