The air quality in the city，________ is shown in the report，has improved over the past two months. (2012·福建，23)
| A．that | B．it |
| C．as | D．what |
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The air quality in the city，________ is shown in the report，has improved over the past two months. (2012·福建，23)
| A．that | B．it |
| C．as | D．what |
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