The hard-working peasants and their happy life we saw in the countryside made a wonderful impression on us.
A. /
B. who
C. which
D. whom
网友回答
(答案→)A. /
B. who
C. which
D. whom
解析：先行词是the hard-working peasants and their happy life，既有人又有物，关系代词只能用that，又因为在定语从句中作saw的宾语，故可以省略。不管题干有多长，抓住主要成分将其简化，减小难度。