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。
由they have eggs or young chicks與they don’t use a nest之間的邏輯關(guān)系可以推出該空表示“除非”，因此應(yīng)填unless引導(dǎo)條件狀語(yǔ)從句。
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