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    精英家教网 > 初中英语 > 题目详情

    【题目】Tom work well at school. We must help him.

    A. doesn't B. don't C. isn't D. aren't

    【答案】A

    【解析】

    句意：汤姆在学校学习不好，我们必须帮助他。考查助动词。work为实义动词，在句中作谓语，所以变否定句要借助于助动词do的适当形式，而不能用be动词，所以排除C、D选项；do用于主语是第一人称、第二人称和第三人称复数形式的句子中，does用于主语是第三人称单数的句子中。本题中主语是第三人称单数Tom，所以助动词选用does，其否定式在does后直接加not，缩写为doesn't；故答案选A。

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