◎ 题干
—_______ to keep our classroom clean and tidy.
—You are right.
[     ]
A. That's our duty
B. This is our duty
C. It's our duty
D. The duty is
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—_______ to keep our classroom clean and tidy.—You are right.[ ]A. That's our dutyB. This is our dutyC. It's our dutyD. The duty is …”主要考查了你对  【名词】【物主代词】【it的用法】  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。