问题标题:
1.Whenwalkingalongtheriver,Ipickedupmanybeautifulstones.改同义句WhenI__________along
问题描述:

1.Whenwalkingalongtheriver,Ipickedupmanybeautifulstones.改同义句WhenI__________along

董笑菊回答:
  因为是两个空,所以应该是:   WhenI__was_____walking___alongtheriver,Ipickedupmanybeautifulstones.
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