阑尾残端安全处理的最好方法是（）
A.结扎
B.结扎和包埋
C.单纯包埋
D.挤压
E.石炭酸烧灼
参考答案：B
Rebecca ________ to Shanghai and she won’t come back until next Monday.
A．has been
B．had gone
C．went
D．has gone
简述教师道德良心及其作用
