It's clear that fish cannot live________water．A.withB.withoutC.inD.under
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B解析分析：without water(没有水)(延伸)without 1)“没有”，是介词，不是动词：Without breakfast．he went to school．2)without+动词+ing，“不做……”：Without having breakfast．he went to school．3)“如果没有……”(表示条件)：It's clear that fish cannot live without water．＝It's elear that fish cannot live if there is no water around them．