问题
选择题
Don’t ______ a person only because he has failed in an examination.
A．look up
B．look down
C．look down on
D．look up to
答案
答案：C
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Don’t ______ a person only because he has failed in an examination.
A．look up
B．look down
C．look down on
D．look up to
答案：C
缺失，行
固定义齿修复一年，目前自觉基牙咬合痛。其主要原因为（）。