问题

I can’tunderstand _______ Apple’s iPad 2.
A: why are they so madabout
B: why they are 80 Bad about
C:how are they so mad about
D:, how they are 80 mad about
B: why they are 80 Bad about
C:how are they so mad about
D:, how they are 80 mad about
正确答案是: