He was last seen _________in his office ...

He was last seen _________in his office at about 7:15 p.m..

A. workB. working

C. to workD. worked

B 【解析】试题分析：句意：在下午7点15他被看到在他的办公室工作了，see sb doing sth看到某人做某事，改为被动语态是sb be seen doing表示某人被看到正在做某事。根据句意，故选B。考点：考查动词的语态的用法

考点分析：

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