The reason for usage 'too'?

[federicoo]

English Language Tests, Intermediate level

ESL/EFL Test #248 "'Enough', 'a lot' and 'too' (1)", question 1

It's such a beautiful day and it's not ......... far, so I'm going to walk to the bus stop today. Thanks for offering me a ride though.

(a) enough
(b) a lot
(c) too

English Language Tests, Intermediate level

ESL/EFL Test #248 "'Enough', 'a lot' and 'too' (1)", answer 1

It's such a beautiful day and it's not too far, so I'm going to walk to the bus stop today. Thanks for offering me a ride though.

Correct answer: (c) too
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The reason for usage 'too'?

federicoo

[Linda]

Yes, you are correct.
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[Einy]

here you would too or so - the reason for "too" is because is used to show degree. Something is too hot, or not too far.