问题
选择题
________that he made an obvious mistake，Jeff went on with his speech.
A．Not realized
B．Not realizing
C．Not to realize
D．Not to have realized
答案
答案：B
题目分析：考查分词，名词he和动词realize是主谓关系，所以用现在分词做状语，句子意思“没有意识到他明显的错误，杰夫继续他的演讲”
点评：做此类题时，首先判断名词和动词的关系，如果名词和动词是主谓关系，那么用动名词做状语；如果是动宾关系，则用过去分词作状语