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I can’t imagine what air we would be bre...

I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.

A. hadn’t done        B. didn’t do

C. haven’t done        D. don’t do

 

B 【解析】 试题分析:根据语境“我无法想象如果我们不采取措施阻止空气污染,我们将呼吸什么样的空气”可知该处是对将来情况的虚拟,if条件句要用一般过去时,故选B。 考点:考查虚拟语气  
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Experts suggest that parents should let their child do tasks that he is physically and mentally capable of doing by himself, ______ will help to build a self-confident kid.

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增加:在缺词处加一个漏词符号(∧),并在此符号下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

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