【题目】The secretary worked late into night, ________ a long speech for the president.
A. to prepare B. preparing
C. prepared D. was preparing
在线课程【答案】B
【解析】试题分析：考查非谓语动词。句意：秘书工作到深夜，在为董事长准备一个很长的演讲稿。前面一句已经有谓语动词worked，且两句之间没有连词，故判断空格处用非谓语动词。根据逻辑主语The secretary与prepare之间是主动关系，故要用v-ing形式。故选B。