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问题 单项选择题

金瓷冠修复进行牙体预备时候，前牙切缘应至少磨除

A．1mm
B．1.5mm
C．2mm
D．2.5mm
E．3mm

答案

参考答案：C

改错题

You should have done your homework by this way.
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选择题
They asked me ______ your teachers.

A. thank
B. to thank
C. thanking
D. thank to
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