lovikansal wrote:
Even after reading all of the answers, I am confused. How is the modifier "more than all the North American Great Lakes combined" different in A and B?
From what I understand, both of them are modifying "20 percent of the world's fresh water". So, why is the modifier in B wrong (other than the reason relative pronouns should not be followed by acomma)?
Don't focus only on that one difference. A and B have other differences too.
Here is one other difference:
Core sentence
...
