问题
选择题
The time _________ I first spend with Nelson Mandela was a very difficult period of my life.
A． when
B． which
C． of which
D． at which
答案
答案：B
题目分析：句意：我第一次和曼德拉度过的时光是我生命中非常困难的一段时期。这个句子包含一个定语从句，且关系词在从句中作宾语，指物，故用关系代词 which，选B。