A．[Cu（NH3）4]Cl2
B．Na2[SiF6]
C．Na3[AlF6]
D．K2[Co（SCN）4]
AD
--- You must obey every word of mine.
--- _____ I don’t?
A．What if
B．So what
C．How if
D．Only if
内退人员是否算作“从业”？
