问题标题:
Theyhavebeencollectingshellsforthereyears.(改为同义句)HasTombeenskatingforhours?(做否定回答)Mymotherhasbeencollectingstampsforabouttenyears.(向画线句子提问)
问题描述:

Theyhavebeencollectingshellsforthereyears.(改为同义句)

HasTombeenskatingforhours?(做否定回答)

Mymotherhasbeencollectingstampsforabouttenyears.(向画线句子提问)

任伟回答:
  1.Theyhavebeencollectingshellssincethreeyearsago.   2.No,hehasn't.   3.Whathasyourmotherbeencollectingforabouttenyears?   不明白的再问哟,请及时采纳,多谢!
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