．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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