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    .Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.

    A. why    B. how

    C. unless D. where

    C。


    解析:

    将四个选项的意思分别套入句中，只有填unless时意思最通顺。为便于理解，句子也可转换成：Most birds find it safe to sleep in the trees, but they don’t use a nest unless they have eggs or young chicks.

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