Then professor walked onto the platform and seated himself in a chair, ______ for answering question...
2022-11-28 21:32:19 188次 2013-2014学年浙江省六校（省一级重点校）高三3月联考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Then professor walked onto the platform and seated himself in a chair, ______ for answering questions.
A. had prepared B. being prepared C. preparing D. prepared
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