专四
A．or
B．either
C．but
D．and
【解析】考查连词。OF表示两个分句是二者选其一的关系；either表示两者皆可；but表示转折关系；and则是并列关系．表示两者都是。句中约翰逊既是系主任又是专家，因此选D。
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