The question that puzzled them is ______ they can get rid of the air pollution in the area.A.how is it thatB.that howC.what is itD.how it is that
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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