Don’t forget to turn on your radio at 7 p.m. this evening. We’ll be back _______ then.
| A．in the air | B．by air | C．on the air | D．off the air |
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Don’t forget to turn on your radio at 7 p.m. this evening. We’ll be back _______ then.
| A．in the air | B．by air | C．on the air | D．off the air |
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