the poem a second time, the meaning will bee clearer to you.
A. Our having read
B. When you read
C. While reading
D. If reading
网友回答
A. Our having read
(答案→)B. When you read
C. While reading
D. If reading
解析：此题中前后主语不一致，从句应加上相应的主语，句意：当你在读一遍这首诗，对你来说意思就会变得更清楚了。所以选B。