My sister is the phone.A. taking onB. talking onC. walking inD. having at

问题补充：

My sister is the phone.

A. taking on

B. talking on

C. walking in

D. having at

答案：

A. taking on

(答案→)B. talking on

C. walking in

D. having at

解析：take拿，取，带走；talk谈论；walk步行；have，有，从事。句意：我的姐姐正在电话里说话。英语中通过某种媒介用介词on，结合语境可知选B。