We had to our discussion because one of us suddenly got ill. A.take off B.turn off C.break

问题补充：

We had to our discussion because one of us suddenly got ill.

A.take off B.turn off C.break off

答案：

解析：因为一个学生突然生病了，那么我们的讨论应该终止意思才符合，break off表示停止的含义，与题意较符，故选C，take off脱掉或起飞，turn off关上。