We don’t allow ____ in the office. But you are allowed ______ in the open air.
| A．smoking; smoking | B．to smoke; to smoke |
| C．smoking; to smoke | D．smoke; smoking |
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We don’t allow ____ in the office. But you are allowed ______ in the open air.
| A．smoking; smoking | B．to smoke; to smoke |
| C．smoking; to smoke | D．smoke; smoking |
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