Why "learned" not "learnt"

[Igor Lazarev]

Test No. errors/inter-8 "Tenses", question 1

I have learn many things in my class today and now I can do my homework without any problems.

(a) learn
(b) things
(c) do
(d) any

Test No. errors/inter-8 "Tenses", answer 1

I have learned many things in my class today and now I can do my homework without any problems.

Correct entry: learned
The error was: (a) learn

You have found the error but your entry is incorrect.
I have learnt many things in my class today and now I can do my homework without any problems.

[Torsten]

Hi Igor,

Many thanks for brining up that issue. You right - both spellings are correct, 'learnt' as well as 'learned'. We'll make the appropriate changes.
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