问题
选择题
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
答案
D
本题主要考查对句子结构的理解。根据句子中的walked onto…and seated himself…可知，句子表示几个动作的延续，应该用几个动词的并列答案选D。