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