The question that puzzled us is _____ we can get rid of the air pollution in the area.
| A．that how | B．how is it that | C．what is it | D．how it is that |
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The question that puzzled us is _____ we can get rid of the air pollution in the area.
| A．that how | B．how is it that | C．what is it | D．how it is that |
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