When I entered the room,I saw him ( ) in a front seat staring at a picture in a strange way.A、to sitB、is sittingC、satD、sitting【正确答案】:D【题目解析】:see sb. doing,句子含义为当我走进房间时,看见他以一种很奇怪的方式盯着那幅图看。
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