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There is so much smog these days. We all...

There is so much smog these days. We all want to know __________.

A.how we can do to prevent it B.when can we prevent it

C.what we can do to prevent it D.why can’t we prevent it

 

C 【解析】 句意:这些天烟雾太多了。我们都想知道我们能做些什么来阻止它。 考查宾语从句。how we can do to prevent it我们能怎么做来阻止它;when can we prevent it什么时候能阻止它;what we can do to prevent it我们能做什么来阻止它;why can’t we prevent it为什么我们不能阻止它;根据宾语从句的语序必须要用陈述句语序可知,排除B/ D选项;而A/ C选项中引导词不同,再分析从句的句子结构可以看出,从句中we是主语,can do是谓语,而do是一个及物动词,后面必须要接宾语,而how不能做宾语,只有what可以做do的宾语,故选C。  
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