◎ 题干
— You must have your work done within 2 days. 
— Finishing a task in such short time is a (an) _____.
[     ]
A. conclusion
B. challenge
C. explanation
D. approach
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—You must have your work done within 2 days.— Finishing a task in such short time is a (an) _____. [ ]A. conclusion B. challenge C. explanation D. approach…”主要考查了你对  【名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。