Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t...
2023-01-17 23:31:23 84次 2010-2011学年浙江省高三上学期第一次月考英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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.
where D.
unless
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