This new airport has been in service for six years

发布时间：2021-02-18 14:58:03

This new airport has been in service for six years ago错在哪里可是通过since引导后似乎ago还是可以出现在完成时的

网友回答

去掉ago.
This new airport has been in service for six years./This new airport has been in service since six years ago.
两种改法Both OK.
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