They have been collecting shells for there years.（改为同义句）
Has Tom been skating for hours?(做否定回答）
My mother has been collecting stamps for about ten years.(向画线句子提问）
人气：335 ℃ 时间：2019-08-22 11:57:29
解答
1.They have been collecting shells since three years ago.
2.No,he hasn't.
3.What has your mother been collecting for about ten years?
不明白的再问哟,请及时采纳,多谢!
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