一个选择题(英语)he has studied English _______________.a.since two
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一个选择题(英语)
he has studied English _______________.
a.since two years ago
b.for two years.
可是a 哪里错了?为什么?
he has studied English _______________.
a.since two years ago
b.for two years.
可是a 哪里错了?为什么?
![一个选择题(英语)he has studied English _______________.a.since two](/uploads/image/z/15313044-12-4.jpg?t=%E4%B8%80%E4%B8%AA%E9%80%89%E6%8B%A9%E9%A2%98%EF%BC%88%E8%8B%B1%E8%AF%AD%EF%BC%89he+has+studied+English+_______________.a.since+two)
since的四种用法
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980,last month,half past six).
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
完成时的句子也可以加for+一段时间表示在这段时间已近完成的动作
所以两句都没错
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980,last month,half past six).
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
完成时的句子也可以加for+一段时间表示在这段时间已近完成的动作
所以两句都没错
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