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为什么选D 而不选C .选C非谓语动词主动式.

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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为什么选D 而不选C .选C非谓语动词主动式.

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为什么选D 而不选C .选C非谓语动词主动式.
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
为什么选D 而不选C .选C非谓语动词主动式.

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为什么选D 而不选C .选C非谓语动词主动式.
prepare 常做及物动词.如prepare oneself for sth
所以这里用prepared for（语法上类似于doveted to）

分词的逻辑主语是主句主语The professor,他们之间有主动关系.

其实有的时候中国人出的一些题老外也搞不懂,这个句子看你要怎么分析,如果用preparing 也可以说是做伴随状语,就像the teacher walked into the classroom holding a book in his hand.如果用prepared 也可以,因为它的主语是前面的professor和前面的动词事态保持一至

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