问题补充：
Thinking of the days, when he was looked down upon as a poor peasant, .
A. his heart was filled with sorrow
B. tears came down his face
C. he was in great sorrow
D. we found him wiping his eyes
答案：
A. his heart was filled with sorrow
B. tears came down his face
(答案→)C. he was in great sorrow
D. we found him wiping his eyes
解析：考查主语一致。thinking of the days,作所选主句的状语，该状语部分的逻辑主语已经省略，必须与所选主句的逻辑主语一致，根据when he was looked down upon as a poor peasant可知，该句的主语是he，故选择C
