If we do not deal with ________ problem caused by air pollution, our planet may no longer be ________ healthy place for us.
| A．a; the | B．a; a |
| C．the; a | D．the; the |
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If we do not deal with ________ problem caused by air pollution, our planet may no longer be ________ healthy place for us.
| A．a; the | B．a; a |
| C．the; a | D．the; the |
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