单项选择题

Let's learn to use the problem we are facing（）a stepping-stone to future success.

A. to
B. for
C. as
D. by

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单项选择题
The lawyer listened with full attention，（）to miss any point.

A. not trying
B. trying not
C. to try not
D. not to try
单项选择题
教学原则反映了( )。
A．教育现象
B．教学规律
C．教学现象
D．师生关系
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