题目：
患者，女，
缺失，可摘局部义齿修复，
基牙，在下列何种情况下可设罩上返卡环（）
A．
二类导线
B．三类导线
C．
一类导线
D．二类导线
E．三类导线
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E
患者，女，缺失，可摘局部义齿修复，基牙，在下列何种情况下可设罩上返卡环（） A．二类
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