择题When did you decide to be a teacher? Let me see.I am thirt

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择题When did you decide to be a teacher? Let me see.I am thirty,and I have wanted to be one since_
a twenty years b twenty years ago c I had twenty years d I was twenty
答案为什么是d
since+一段时间+ago为什么不可以？

d I was twenty 从宏观上来看就是一个时间点,而连词since的后面就要求加时间点,故正确.
再问：您好！since+一段时间+ago也是可以用于完成时的。
再答： since不可以+一段时间
再问：但since的后面接ago 是可以用时间点的如 They have lived in that house since two years ago.
再答：给个例句如何？
再问：如 They have lived in that house since two years ago.
再答：没错。这个 two years ago是指发生动作lived的第一天，从宏观上来说，它是实质仍然是一个时间点了。
再问：明白了。非常感谢您！我在学新二。语法强化上的题。请问如何与您联系请教？

择题When did you decide to be a teacher? Let me see.I am thirt 1.When did you decide to be a teacher? did you decide to be a teacher? I have made a -------------(decide)to be a teacher I am to be to see you Did you your key?--Let me see.Oh,no!I it at school.A.forget Let you and___friends.A,I am B,I are C,me are D,me be 帮我翻译一段英文：I am going to be a teacher when i grow up am,to,a,teacher,i,when,going,i,grow,be,up连词成句 I am going to be a teacher when I ----middle school. i want to be a teacher when I am older改为同义句 let you and ( )friends.A I am B I are Cme are D me be