Sorry LiMing I’m afraid I have to . Someone is calling me.A. ring overB. ring offC. ring

问题补充：

Sorry, LiMing, I’m afraid I have to . Someone is calling me.

A. ring over

B. ring off

C. ring out

D. ring up

答案：

A. ring over

(答案→)B. ring off

C. ring out

D. ring up

解析：考察词义，ring off 是“挂断电话”的意思