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Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they d
题目简介
Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they d
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.why
B.how
C.unless
D.where
题型:单选题难度:偏易来源:不详
答案
C。
将四个选项的意思分别套入句中,只有填unlessunless时意思最通顺。为便于理解,句子也可转换成:Most birds find it safe to sleep in the trees, but they don’t use a nest unless they have eggs or young chicks.
题目简介
Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they d
题目详情
答案