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
D

試題分析：考查強調(diào)句的特殊問句做表語從句：句意：那個令他們無法理解的問題是-怎么才能-他們才可以除掉這里的空氣污染。強調(diào)句的特殊問句是：特殊疑問詞+is it+that…，這里做表語從句，用陳述語序，所以選D。
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