患者女，45岁。<img src="/Image1/f7/f7fa676af2ab13e83af1acdc1c0611fc.gif" style="height: auto; max-width: 100%;" />缺失，医师设计<img src="/Image1/21/21b0ab13c58211ba6ea8d59e08f6e0c6.gif" style="height: auto; max-width: 100%;" />RPI卡环组，<img src="/Image1/9f/9fbcb917b5ab43b7898da7c49ceab259.gif" style="height: auto; max-width: 100%;" />联合卡环，舌连接杆连接。技师按照医师要求制作好熔模，安插铸道，然后对支架熔模进行包埋，制作铸型。该病例基托纵裂最可能的原因是（）<br>A:前伸<img src="/Image1/aa/aaa60c383e689114a834eed43eee3643.gif" />不平衡<br>B:侧<img src="/Image1/aa/aaa60c383e689114a834eed43eee3643.gif" />不平衡<br>C:硬区未缓冲<br>D:唇侧基托与黏膜不密合<br>E:前牙呈深覆<img src="/Image1/aa/aaa60c383e689114a834eed43eee3643.gif" />深覆盖