我们正在吃早餐时,电话响了。

We were having breakfast when the phone rang.

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We were having breakfast when the phone rang.

having 是动词 have 的现在分词形式,have breakfast 表示"吃早餐"。 这里用过去进行时 were having 表示"当时正在吃早餐"的动作被电话铃声打断。

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