问题补充：
The car on half way so we had to walk to school.
A. broke up
B. broke out
C. broke off
D. broke down
答案：
A. broke up
B. broke out
C. broke off
(答案→)D. broke down
解析：A. broke up分手，结束B. broke out 爆发 C. broke off中断 D. broke down抛锚句意：我们的车在半路抛锚了，我们不得不走回学校。故选D.
