Question

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

Answer 1

D

    
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。