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The question that puzzled them is ____ t...

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

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

 

D 【解析】     试题分析:考查表语从句。此处是强调句型的特殊疑问句做表语从句,语序为:疑问词+it +is +that+被强调部分,故答案选D。句意:使他们困惑的是他们如何才能去除这个地区的空气污染。 考点:考查表语从句。
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