()
A.
B.
C.
D.
参考答案:C
The doctor recommended that you ___ swim after eating a large meal. [ ]
A. wouldn't
B. couldn't
C. needn't
D. shouldn't
临床常用的根管消毒方法是()
A.根管荡洗
B.根管封药
C.微波处理
D.电解治疗
E.高频电疗