Mr. Howard, （ ）his study of the situation, was ready to talk abo

Mr. Howard, （ ）his study of the situation, was ready to talk about it when I arrived.
A、completed
B、having completed
C、had completed
D、being completed
【正确答案】：B
【题目解析】：动词的特殊用法-分词。题干译为“已经完成对此情况研究的霍华德先生在我到达时正要谈论此话题”，这句话中状语部分complete和主语Mr.Howard之间是主动关系，因此A和D项排除，此外本句的谓语动词是was ready to talk about,所以空白处应是分词结构作状语，因此选择B选项。