while we__(wait) for the bus ,a girl ___(run) up to us 应填什么为什么?

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while we__(wait) for the bus ,a girl ___(run) up to us 应填什么为什么?
while we__(wait) for the bus ,a girl ___(run) up to us 应填什么为什么?

while we__(wait) for the bus ,a girl ___(run) up to us 应填什么为什么?
were waiting.ran

while we_were waiting_(wait) for the bus ,a girl _ran__(run) up to us
while 的句子主句都用进行时哦,从句用过去式或者也是进行时的!
O(∩_∩)O~