Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’

题目简介

Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’

题目详情

Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.
A.whyB.howC.unlessD.where
题型:单选题难度:中档来源:不详

答案

C。
由they have eggs or young chicks与they don’t use a nest之间的逻辑关系可以推出该空表示“除非”,因此应填unless引导条件状语从句。

更多内容推荐