– You must have your work done within 2 days. Finishing a task in such short time is a

发布时间：2020-08-16 18:16:36

– 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

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A. conclusion
(答案→)B. challenge
C. explanation
D. approach
解析： 略
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