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Is this sentence correct?

I was on leave last Thursday and Friday, therefore cannot reply your email promptly. Sorry.
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Hi,

Is this sentence correct?

I was on leave last Thursday and Friday, therefore cannot reply your email promptly. Sorry.

I was on leave last Thursday and Friday, so I'm sorry that I could not reply to your email promptly.

Clive
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Teachers: We supply a list of EFL job vacancies
Thank you Clive
I was on leave last Thursday and Friday, so I'm sorry that I could not reply to your email promptly.