The question that puzzled them is ____ they can get rid of the air pollution in the area.
A．how is it thatB．that howC．that it is howD．how it is that
D
    
試題分析:考查表語從句。此處是強調(diào)句型的特殊疑問句做表語從句，語序為：疑問詞+it +is +that+被強調(diào)部分，故答案選D。句意：使他們困惑的是他們?nèi)绾尾拍苋コ@個地區(qū)的空氣污染。
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