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Tom work well at school. We must help hi...

Tom       work well at school. We must help him.

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

 

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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