河南成教 / 大学英语
正确率：100%
17[单选题]
When I entered the room, I saw him _ _ _ _ _ in a front seat staring at a picture in a strange way.
A.to sit
B.is sitting
C.sat
D.sitting
When I entered the room, I saw him _ _ _ _ _ in a front seat staring at a picture in a strange way.
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