People should open the window in the morning to make air ______ in order to keep the indoor air fresh.
| A．spread |
| B．remove |
| C．float |
| D．circulate |
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People should open the window in the morning to make air ______ in order to keep the indoor air fresh.
| A．spread |
| B．remove |
| C．float |
| D．circulate |
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