Most birds find it safe to sleep in the trees, but ______ they have eggs or youn
题型：不详难度：来源：
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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答案
| D |
解析
| 考查连词，unless除非，相当于if not，句意是：大多数鸟觉得睡在树上是安全的，但如果不是有小鸟，它们是不会用鸟巢的。选D。 |
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