题目内容
20.The temperature of our earth will become higher and higher we take actions right now.( )| A. | unless | B. | if | C. | as soon as | D. | as |
分析 除非我们立刻采取行动,否则地球温度会越来越高.
解答 答案:A.
本题考查的是从属连词的辨析.根据题意,从主句句意"地球温度会越来越高"和从句句意"我们立刻采取行动"来看,这里需要一个表假设的连词,主句用一般将来时从句用一般现在时说明后句是表假设的条件状语从句,结合选项,unless可以引导一个表假设的条件状语从句,意为"除非",相当于if not.故选A.
点评 联系前后语境,在准确把握前后句关系的基础上,先推测出大体句意;再结合关键词利用其固定用法选出正确答案.
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