Please look at the exercise below:
Put the correct forms of the suggested words into the blank:
Although some societies are… undeveloped,their language are very complex.
(technology)
The answer is Technological but I think it should be Technologically because adverb must be put before adjective.
Please explain it to me.
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You are right; the answer sheet is wrong.
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Hi Duc
Are you keeping a list of all the corrections that need to be made in that book you’re using? 
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Very funny,Amy 
Indeed today I went to class and it is one of the exercises my teacher gave me. So,her book is incorrect ,not mine
My advice - throw the book in a trash can, unless your goal is to correct it of course 