根据魔方格专家分析，试题“— _______ in the box?— There's a pen in it. [ ]A. What B. What's C. What are D. Who's …”主要考查了你对 【疑问代词】，【系动词】 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。
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