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dsince+一段时间+ago为什么不可以？
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择题Whendidyoudecidetobeateacher?Letmesee.Iamthirty,andIhavewantedtobeonesince_atwentyyearsbtwentyyear
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dsince+一段时间+ago为什么不可以？
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？
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dsince+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.
D，按照语法来说是可以的，但表示的意思是我从十岁起就想成为老师，未免太早了吧？
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