问题
选择题
Clean water and fresh air are essential for our daily life, _______ we can’t live.
A．by which
B．without which
C．that
D．on which
答案
答案：B
题目分析：句意：干净的水和新鲜的空气是我们日常生活中必不可缺少的，没有它们我们就不能活。此处Clean water and fresh air是先行词，在定语从句中在介词的宾语。故选B。