—I'm afraid Mary isn't in.
—Oh well，I'll________later.
A．ring back B．ring off
C．ring up D．ring out
—I'm afraid Mary isn't in.
—Oh well，I'll________later.
A．ring back B．ring off
C．ring up D．ring out
A ring back(＝phone sb.again)再打电话来；ring off挂断电话；ring up给……打电话；ring out发出响亮而清晰的声音。句意：——恐怕玛丽不在家。——好吧，我晚会儿再打来。