◎ 题干
– You must have your work done within 2 days.
-- Finishing a task in such short time is a (an) __________.
A.conclusionB.challengeC.explanationD.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.conclusionB.challengeC.explanationD.approach…”主要考查了你对  【可数名词及其单复数】【集合名词】【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。