题文
Our plane will . All the passengers, please your mobile phones.
| A．take off; turn off | B．turn off; take off |
| C．take off; take off | D．turn off; turn off |
Our plane will . All the passengers, please your mobile phones.
| A．take off; turn off | B．turn off; take off |
| C．take off; take off | D．turn off; turn off |
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