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since的用法有哪些
作者：佚名 信息來源：本站原創 更新時間：2011-8-31
初中英語語法大全：since的四種用法
1) since +過去一個時間點 (如具體的年、月、日期、鐘點、1980, last month, half past six)。
I have been here since 1989.
2) since +一段時間+ ago
I have been here since five months ago.
3) since +從句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段時間+ since從句
It is two years since I became a postgraduate student.
since的用法有哪些
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