Interviews were carried out over the telephone，via e－mail or fax or face to face in four cities including Beijing，Shanghai，Guangzhou and Wuhan.
A. supremely
B. extremely
C. officially
D. slightly
网友回答
A. supremely
B. extremely
(答案→)C. officially
D. slightly
解析： 根据句意，进行正式的访谈(如通过电话、电子邮件、传真或面谈)，应选副词officially。