◎ 题干
—How much shall I pay for the phone call?
—You________. This is free of charge.
A.shouldn't B.can't C.don't have to D.mustn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—How much shall I pay for the phone call? —You________. This is free of charge.A.shouldn'tB.can'tC.don't have toD.mustn'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。