根据n多题专家分析,试题“Be polite. You ________ talk to the old like that.[ ]A. couldn't B. needn't C. mustn't D. wouldn'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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