[单选题,3.3分] 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

[单选题,3.3分] 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

出自：河南大学-大学英语（一）

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