He was last seen _________in his office at about 7:15 p.m..A．workB．workingC．to workD

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

A．work

B．working

C．to work

D．worked

答案

B解析:
此题重点考查固定结构see sb doing sth 表示看到某人正在做某事。

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