—________. If time permits, I may go to Shanghai with my friends.
A:Up to you
B:It depends
C:Forget it
D:Never mind
漂白粉的主要成分是Ca(ClO)2和CaCl2,其中钙元素的化合价是+2,氧元素的化合价是-2,则Ca(ClO)2中氯元素的化合价是()