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问题 单项选择题

拔除阻生的下颌第三磨牙后15天，患者仍感到下唇麻木，常见的原因是（）。

A.患者感觉异常

B.注射针刺中了下牙槽神经

C.麻药中带有杂质

D.牙根折断

E.下牙槽神经的损伤

答案

参考答案：E

选择题
某同学的座位号为（2，4），那么该同学的位置是（   ）
A．第2排第4列
B．第4排第2列
C．倒数第4排第2列
D．不好确定
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单项选择题

He had studied hard, he would have been able to pass the exam.

A．He had studied harder

B．If only he studied more

C．Had he studied harder

D．When he studied more
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