I was ____in the middle of my call because I had no more pennies

I was ____in the middle of my call because I had no more pennies to put in the box.
A、broken in
B、hung up
C、cut off
D、put down
【正确答案】：C
【题目解析】：该题测试动词短语的用法。C选项cut off意思是“切断、中断”；符合题意。而选项A意思是“插话”；B选项hang up意思是“放上话筒，挂断电话”. D选项put down意思是“放下”，均与题意不合，故不用。