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精英家教網 > 高中英語 > 題目詳情

.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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