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
考查連詞，unless除非，相當(dāng)于if not，句意是：大多數(shù)鳥覺得睡在樹上是安全的，但如果不是有小鳥，它們是不會(huì)用鳥巢的。選D。
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