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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．whereD．unless
    D
    考查连词，unless除非，相当于if not，句意是：大多数鸟觉得睡在树上是安全的，但如果不是有小鸟，它们是不会用鸟巢的。选D。
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