题文
Passengers on board aren't allowed _____ calls during take-off．
| A．making or receiving | B．to make or receive |
| C．to have made or received | D．having made or received |
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Passengers on board aren't allowed _____ calls during take-off．
| A．making or receiving | B．to make or receive |
| C．to have made or received | D．having made or received |
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