◎ 题干
---Why does Tommy look unhappy ?
--- Because his teacher makes him _______ the classroom all by himself .
A.to cleanB.cleanC.cleansD.cleaning
◎ 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“---Why does Tommy look unhappy ? --- Because his teacher makes him _______ the classroom all by himself .A.to cleanB.cleanC.cleansD.cleaning…”主要考查了你对  【不定式】【分词】【动名词】  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。