题目内容
【题目】I have a dog. I have to (walk) him every day.
【答案】walk
【解析】have to+动词原形，这是固定结构。表示必须（不得不）做某事。故填walk。
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题目内容
【题目】I have a dog. I have to (walk) him every day.
【答案】walk
【解析】have to+动词原形，这是固定结构。表示必须（不得不）做某事。故填walk。