腭前神经阻滞麻醉时出现恶心或呕吐，可能是由于( )
A．注射点过高B．针尖刺入过深C．针尖刺入过前D．针尖刺入过后E．麻药注射入血管内
参考答案：D
Getting rid of bad habit is________forming a good one. [ ]
A. an effort much as
B. much an effort as
C. as an effort much as
D. as much an effort as
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