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the president came to the front and sat down,for the speech

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the president came to the front and sat down,for the speech
the president came to the front and sat down,for the speech
A.to prepare B.prepared C.preparing Dprepare
答案:B
解释:由句中逗号可知,选项为发谓语结构做状语,排除使用动词原形的D;不定式放在句尾且用逗号隔开时,一般只做结果状语,表示出乎意料的结果,但是明显不符合句子上下文的句意,排除A.如:I got to the station, only to find that the train had left.句子主语the president和选项动词之间构成一个固定短语搭配:(sb) be prepared for sth.做非谓语时,只需要去掉结构中的be动词即可,所以答案B为正解.