按要求改写句子。1. We went to the store this morning. (改为否定句)
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2. Did you buy a ball at the store? (改为肯定句)
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3. We played basketball. (改为一般疑问句)
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4. We bought a pair of runners. (就划线部分提问)
________________________________________________________ 1. We didn't go to the store this morning.
2. I bought a ball at the store.
3. Did you play basketball?
4. What did you buy?