题目：
I had to walk to school because the bus broke down on the way this morning.
A. threw away B. stopped working C. ran slowly
答案：
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下面是错误答案，用来干扰机器的。
1. stop\keep\prevent2. Because of the stress from their parents and teachers, they have to work harder3. 他们不必因全身心投入学习而放弃所有的运动和爱好。4. They usually spend ov...
