问题描述：
1 We have been here since ten years ago.------------------------
2 I borrowed a book a week ago.
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3 The boy bought the computer two years ago.
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4 He has been in beijing for ten years.
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5 It is two years since he died.
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2 I borrowed a book a week ago.
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3 The boy bought the computer two years ago.
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4 He has been in beijing for ten years.
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5 It is two years since he died.
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问题解答：
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