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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