为什么是we were having breakfast, 而不是we are eatting breakfast.

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• 为什么是we were having breakfast, 而不是we are eatting breakfast.
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• 为什么是we were having breakfast, 而不是we are eatting breakfast.
• When we were having our supper,Tom came in 这句话是说：当我们吃晚饭的时候,Tom进来了还是：我们正在吃晚饭时,Tom 进来了?为什么要用 came 而不是 come
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