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1. It's the same song that I sang last week.

or

2. It's the same song as I sang last week.

I was told the second one is correct. Why?
What is the difference between using "as" and "that" here?
Could anyone explain me on this?

Thanks in advance.

With regards,
Servlette
Comments  
I don't know which one is correct but I would prefer to say:

It's the same song I sang last week.

Anybody please correct me if I am wrong.

Thanks!
Hi Meg2589,
I found this on "How to write and speak better" by Reader's Digest.
Let me know when to use "as" and "that".
I think the examples have been provided on the book to differentiate between using "as" and "that".
Since I'm not a native speaker of English, I feel native speakers are in a better position to answer my question.

With regards,
Servlette