Information technology is taught in most schools we have entered the information era.A. s

问题补充：

Information technology is taught in most schools， we have entered the information era.

A. so

B. while

C. for

D. still

答案：

A. so

B. while

(答案→)C. for

D. still

解析：for可用作表因果关系的并列连词，连接两个分句时，后一分句对前一分句进行解释。