Mrs Black isn’t in and I’ll have to ring . I would appreciate it if you ring after 6 o'clock?
A. off; back
B. up; off
C. out; up
D. back; off
网友回答
(答案→)A. off; back
B. up; off
C. out; up
D. back; off
解析： Black女士不在家, 我现在不得不把电话挂上了; 要是你在6点钟后再来个电话我将不胜感激。ring off挂断电话；ring back回电话；ring up 打电话；ring out响起；宣布离去。