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【题目】---Why do I have a cold and a fever?

---Because you ___________ enough exercise.

A. haven’t B. have no C. hadn’t D. don’t have

【答案】D

【解析】句意“-为什么我会感冒和发烧?-因为你没有足够的锻炼”。实意动词变否定,在实意动词前加助动词,并注意相应的时态。根据句意,故选D。

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