◎ 题干
—Please clean up the classroom. It's really a_____.
—OK. I'll do it at once.
[     ]
A. mess
B. dirt
C. matter
D. trouble
◎ 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“—Please clean up the classroom. It's really a_____.—OK. I'll do it at once.[ ]A. mess B. dirt C. matter D. trouble…”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。