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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