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

问题补充：

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

A. work

B. working

C. to work

D. worked

答案：

A. work

(答案→)B. working

C. to work

D. worked

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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