根据魔方格专家分析,试题“You ________ knock at the door. Just come in. [ ]A. don't have toB. can't C. mustn'tD. couldn't…”主要考查了你对 【情态动词】 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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