问题
选择题
The old man often looked back on the past days ________ he worked hard to make a living.
A．which
B．when
C．where
D．that
答案
答案：B
B 考查定语从句。句意：这个老人经常回顾他过去辛苦谋生的日子。分析句子成分可知，先行词为the past days，空处在定语从句中充当时间状语，故用when引导。