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Whenshe(walk)alongthetiver,shesawsomeducksswimminginit请大家说出为什么填waswalking

题目详情
When she____(walk) along the tiver,she saw some ducks swimming in it
请大家说出为什么填 was walking
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答案和解析
由 swimming 看出当她过去正在散步的那个时候,她看见了鸭子正在游泳