文件中的每条记录应该包含（）。
A.多于一个字段
B.关键字段
C.至少一个字段
D.一个注释字段
参考答案：B
_____but he still couldn’t understand the logical connection of the two subjects.
A．Having told many times
B．Having been told many times
C．He was told many times
D．Many times as he was told
简述会议文书的分类。
