问题描述：
I have never been to France ,therefore I can't advise you.这句话对么?
therefore可以这样用吗?如果把therefore换成and therefore对吗?
如果and therefore前没有逗号(像这样I have never been to France and therefore I can't advise you.
therefore可以这样用吗?如果把therefore换成and therefore对吗?
如果and therefore前没有逗号(像这样I have never been to France and therefore I can't advise you.
问题解答：
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