题文
The air in the country is ________ than ______ in the big city.
| A．cleaner, one | B．much more cleaner, that |
| C．much cleaner, that | D．much more cleaner, this |
The air in the country is ________ than ______ in the big city.
| A．cleaner, one | B．much more cleaner, that |
| C．much cleaner, that | D．much more cleaner, this |
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