They___(ride)along the road when it began to rain.中的横线上应填什么形式?3Q

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They___(ride)along the road when it began to rain.中的横线上应填什么形式?3Q
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They___(ride)along the road when it began to rain.中的横线上应填什么形式?3Q
They___(ride)along the road when it began to rain.中的横线上应填什么形式?3Q

They___(ride)along the road when it began to rain.中的横线上应填什么形式?3Q
were riding 当天开始下雨的时候,他们正在路上骑马.过去正在进行时