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    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

    B

    【解析】考察非限制性定语从句。干净的水和清新的空气是我们日常生活中必须的，没有它们我们不能存活。这里考察的是“介词+关系代词”引导的非限制性定语从句，前面介词的搭配和先行词或者句子中谓语有关。clean water and fresh air是这个定语从句的先行词，without clean water and fresh air，we can’t live没有干净的水和清新的空气，我们不能活下来。根据句意，故选B

    考点：考察非限制性定语从句。

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