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【答案】1. in at 2. what how 3. playing play
【解析】
1.Joe is good in the long jump.应改为:Joe is good at the long jump. be good at 是擅长……,是固定用法。
2.I’ll teach you what to swim.应改为:I’ll teach you how to swim..我会教你怎么游泳。
3.I often playing basketball after school.应改为:I often play basketball after school. 我常常放学后打篮球。