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?

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

关于英语1.He has _ us English since he came here.A.tahght B.teac 如何把He said "I have studied English since I was a boy."改为间接引语英语选择题-English has a large vocabulary He has been watching English movies since about two month 这句 He has (studied) English for three years 同义词互换 a learned b h Jo has studied abroad since he___from high school.A.graduate he has been in english since last 1.He has studied English for 4 years .(对划线部分提问） He has never studied English._______ ______ (改为反意疑问句） He has studied English for 6 years改为同义句 he has studied english for 4 years一般疑问句 he has studied English for five years 同意句是什么