while I ﹎﹎(run) along .A dog suddenly﹍﹍ (run) across the road 想知道原因.

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while I ﹎﹎(run) along .A dog suddenly﹍﹍ (run) across the road 想知道原因.

while I ﹎﹎(run) along .A dog suddenly﹍﹍ (run) across the road 想知道原因.
while I ﹎﹎(run) along .A dog suddenly﹍﹍ (run) across the road 想知道原因.

while I ﹎﹎(run) along .A dog suddenly﹍﹍ (run) across the road 想知道原因.
was running,ran.第一个空表示正在进行,第二个是突然的一个动作