Most birds find it safe to sleep in the trees, but ________they have eggs or you
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.unless | D.where |
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答案
C。 |
解析
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。 |
举一反三
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