急性糜烂出血性胃炎的诊断主要依靠
A．病史及临床表现
B．X线钡餐检查
C．胃镜检查
D．胃电图检查
E．胃液分析
参考答案：C
简述纠偏工作的主要方法。
They've kept up a friendship with the teacher whom they were at school _____ twenty years ago.
A．with
B．about
C．since
D．till
