4. Then the professor walked onto the platform and seated himself in a chair, for answering questions.
A. had prepared B. being prepared
C. preparing D. prepared
4. D考查非谓语动词。句意：然后教授走上讲台，坐在椅子上，准备回答问题。此处be prepared for sth意为"准备好了做某事"，过去分词短语作伴随状语。所以选D。
题目来源：2015全品语法快练高中英语新课标 > 训练19 非谓语动词和独立主格
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