【題目】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：湯姆在學(xué)校學(xué)習(xí)不好，我們必須幫助他。考查助動(dòng)詞。work為實(shí)義動(dòng)詞，在句中作謂語(yǔ)，所以變否定句要借助于助動(dòng)詞do的適當(dāng)形式，而不能用be動(dòng)詞，所以排除C、D選項(xiàng)；do用于主語(yǔ)是第一人稱(chēng)、第二人稱(chēng)和第三人稱(chēng)復(fù)數(shù)形式的句子中，does用于主語(yǔ)是第三人稱(chēng)單數(shù)的句子中。本題中主語(yǔ)是第三人稱(chēng)單數(shù)Tom，所以助動(dòng)詞選用does，其否定式在does后直接加not，縮寫(xiě)為doesn't；故答案選A。

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