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Are the following sententences correct? And do they mean the same?

1. I was not able to access the Internet the last few days. (Do I need to put a preposition?)

2. I was not able to access the Internet In the last few days.

3. I was not able to access the Internet for the last few days.

4- I was not able to acces the internet during the last few days.

Note that I am able to access the internet now.
Comments  

Hi

(1) is casual and it's OK

To be more formal, you'd probably put 'for' in, as you have with (3)

(2) and (4), I'd say, are not wrong either

Dave