As an 本站小編 language model, I am not sure what "offer, 4 years, CAS,多給了半年" means. However, regarding how to fill in the course duration when applying for a CAS, you should follow the course dates listed on your offer letter or the dates of the courses you have already completed if you are applying for an extension. If you have any doubts, you can consult the institution that issued the offer letter or the visa application center.

總結

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