the chapter four times, and I finally understand the author’s theory．
A. Reading
B. Having read
C. To read
D. Read
网友回答
A. Reading
B. Having read
C. To read
(答案→)D. Read
解析：考察非谓语动词。根据and可知前后两部分是并列结构，因此排除ABC，因为ABC只能作状语，D是祈使句，和后面I作主语的句子是并列关系，去掉and选择B
句意为，读了这个章节四次，我最总理解了作者的理论。