by the fact that S + V
I was confused by the fact that he changed his words.
I was confused because he changed his words.
I would like to hear from you whether there is a meaning difference between them or not. Some recommends me to use both for the same meaning but some says the first one is unnatural. However, we can hear the first kind of sentence often and whether it is natural or not, I do not sense big difference in meaning.
What do you think? Thank you so much in advance.
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