问题
选择题
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
答案
答案：D
题目分析：句意：教授走上讲台，坐在椅子上，准备回答问题，这里使用了be prepared for…为…做好了准备，用过去分词做状语，所以选D。