Please see the sentance below
Composed of heavy-textured clay soil, adobe has great elasticity when moist, but when dry is able of holding its shape
I'm practising spotting the error in sentences and the answer key says that "of holding* is wrong. Although it doesn't supply the right answer, I think it is probably to hold.
2 questions :
1 is the correct answer "to hold"? 2 why is "of holding" marked as being wrong?