在下列各项中，属于固定成本的是( )。
A．长期借款利息
B．原材料费
C．燃料费
D．生产人员工资
参考答案：A
—Zhang Lili hardly had time to think of herself before she saved her students, ______?
—No, she didn't. Her action moved all of us. So she is regarded as "The Prettiest Woman Teacher". [ ]
A. didn't she
B. hadn't she
C. did she
