问题
选择题
Now let me have _____________. [ ]
A. the third try
B. a third try
C. third try
D. this third try
答案
答案：B
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Now let me have _____________. [ ]
A. the third try
B. a third try
C. third try
D. this third try
答案：B
颊向阻生，在行上牙槽后神经、腭前神经阻滞麻醉5分钟后，出现左下唇麻木感，探颊侧牙龈仍有痛感，其原因可能是（）