若a与b互为相反数，则下列式子：①a+b=0，②a=﹣b，③|a|=|﹣b|，④a=b中，一定成立的序号为（ ）
①②③
You’ve done much of the work, and please leave ______ to us.
A．the rest
B．the other
C．another
D．the others
一级维修
