题文
We can never expect _______bluer sky unless we create ______ less polluted world.
| A．a；a |
| B．a；the |
| C．the；a |
| D．the；the |
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We can never expect _______bluer sky unless we create ______ less polluted world.
| A．a；a |
| B．a；the |
| C．the；a |
| D．the；the |
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