题目内容

Clean water and fresh air are essential for our daily life, _______ we can’t live.
A．by whichB．without whichC．thatD．on which
B

试题分析：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。
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