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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．whyB．howC．unlessD．where
    C。
    将四个选项的意思分别套入句中，只有填unlessunless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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