Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?A.off; backB.up; offC.out; upD.back; off
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A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。