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题目
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)

提问时间:2020-06-13

答案
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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