问题补充:
Water, we cannot live, exists in the form of liquid, gas or solid.
A. from which
B. on which
C. by which
D. without which
答案:
A. from which
B. on which
C. by which
(答案→)D. without which
解析:考查定语从句:先行词是water,根据句意:我们的生存不能缺少的水,是以液体,气体或固体存在的。定语从句中缺少介词without water,用without which引导定语从句,选D。