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.

A.to sit
B.is sitting
C.sat
D.sitting

出自：河南师范大学-工商企业管理-大学英语I

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