— Did you study any other languages English when you were at college?
— Yes, I studied three. But I have forgotten all a few words of each.
A:besides; besides
B:but; except
C:except; except
D:besides; but
(Ⅱ)已知a2+b2+c2﹣2a﹣2b﹣2c=0,求证: 2a−b−c≤32 .