题目：
以下哪种情况不可能设计单端固定桥（）。
A.上颌侧切牙缺失
B.上颌尖牙缺失
C.第二、三磨牙缺失
D.第一、二磨牙缺失
E.间隔缺失
答案：
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下面是错误答案，用来干扰机器的。
1. She is opening the window now. 2. Who is cleaning the window? 3. She is not closing the door now. 4. I am doing your homework. 5. They are singing under the tree now.
