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The question that puzzled them is ____ they can get rid of the air pollution in the area.

A.how is it that B.that is how C.what is that D.how it is that

D

解析试题分析:考查强调句的特殊问句做表语从句:句意:那个令他们无法理解的问题是-怎么才能-他们才可以除掉这里的空气污染。强调句的特殊问句是:特殊疑问词+is it+that…,这里做表语从句,用陈述语序,所以选D。
考点:考查强调句的特殊问句做表语从句

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