Last month, I had a problem with my exercise:
Mary is ___________of the two sisters.
A the younger
B the youngest
My teacher sais that the answer was A.
But I foung in one of my Grammar books said that the two is ok.
I took it to my teacher then she said that A is better <the book said "we sometimes use comparatives instead of superlatives">
After a while, I read some kinds of leaflet ,I guess, "KET INformation for Candidates" Of Cambridge.
In that material, I came across one sentence in a reading like this
"But they think the on the fish ate is the best one"
In this situation, there are 2 rings and they use superlatives to compare the 2 things.
So what is the answer? What should I do when I do other similar exercise?