A:k< 43
B:k< 43 且k≠1
C:0≤k≤ 43
D:k≠1
--No, I can't. I don't have a(n) , so I'm not allowed to do it.
a2-1a2+4a+4÷a+1a+2
It is ______for him to get to school on time, because it is raining ______.