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哈皮小暖
It's fun to watch TV in our classroom.They're watching TV happily.侧重点不同，所以用词不同。前者用名词fun后者用副词happily.
summaryzhen
both A and B
气球飞哇
这两个短语表述的重点不同。It's happy to do sth做某事开心重点是：做某事all happy to do sth 强调全部
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