There is a task from a textbook to choose the correct alternative in this sentence:
Does a great deal/considerably wider accessibility inevitably mean a decline in the quest for serious reflection and deeper understanding?"
I know that the correct answer is considerably, but I have no idea what's wrong with a great deal. And not even sure it actually is wrong.
Attached grammar gives the following information:
We can use the following words to intensify and modify comparatives:
considerably/far/much/a lot/a great deal more/less interesting than
I've checked internet, different dictionaries and grammars, but still don't know why a great deal is inappropriate in this case. I've also asked few native speakers and they confirmed that a great deal actually seems to be inappropriate.
So could anyone, please, explain to me why considerably is better in this case?