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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:

將四個選項的意思分別套入句中，只有填unless時意思最通順。為便于理解，句子也可轉換成：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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