Don’t forget to turn on your radio at 7 p.m. this evening. We’ll be back _______ then.
A．in the airB．by airC．on the airD．off the air
C
這題考查介詞短語，in the air在空中，by air乘飛機(jī)，on the air在播放 ，句意是：別忘了今晚7點(diǎn)打開收音機(jī)，那時(shí)我們將回來播放。選C。
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