问题补充：
It was on a cold winter evening his father left home and was never back.
A. where
B. which
C. that
D. when
答案：
A. where
B. which
(答案→)C. that
D. when
解析：句意为：就是在一个寒冷的冬夜，他的父亲离家出走了，再也没回来过
强调句型：It was/is +被强调部分+that从句，此题被强调部分为时间状语：on a cold winter evening
