A:didn’t mean;tried
B:don’t mean;am trying
C:haven’t meant;tried
D:didn’t mean;was trying
— I missed the beginning of ________ cartoon The Lion King.— What a pity! You should leave school half _______ hour earlier.
已知fx=log12x2-ax-a在区间-∞,1-3上是增函数,则a的取值范围是( )