Their friendship broke because they had a flight.A. ofB. downC. awayD. off

问题补充：

Their friendship broke because they had a flight.

A. of

B. down

C. away

D. off

答案：

A. of

B. down

C. away

(答案→)D. off

解析：根据语境可知此句的含义是他们的友谊破裂了，因为他们打了一仗。此题考查的是有关break的固定短语。break off的含义表示破裂，break down表示失灵，停止工作，break away表示脱离；故选D。