问题
选择题
. ---Is Bob still performing?
---I’m afraid not. He is said ______ the stage already as he has become an official.
A．to have left
B．to leave
C．to have been left
D．to be left
答案
答案：A
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Ⅰ度松动，叩痛(+)，患者不能指明患牙位置，颊侧近中窄而深牙周袋10mm，X线片见左侧上后第一磨牙近中根管中下段均匀增宽，远中根牙槽骨未见吸收。