Can you tell me the answer _____ the question. [ ]
A. of
B. for
C. to
D. in
答案:C
硬化萎缩注射法以下哪一项是正确的:()
A.注射后当天即可活动、排便
B.每次注射间隔2~3天
C.防止注射部位过浅
D.注射于痔核上的肌层
E.每次注射的剂量无限制,可随痔核大小而定