问题
选择题
What your bike yesterday? [ ]
A. was happened with
B. happened to
C. was happened to
答案
答案：B
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What your bike yesterday? [ ]
A. was happened with
B. happened to
C. was happened to
答案：B
，用2%普鲁卡因2.5ml做阻滞麻醉，重复一次后才获麻效。拔牙顺利。术后5小时患者仍感下唇麻木而复诊，其原因可能是（）