阿摩線上測驗
3.For safety reasons, radios, CD players, and mobile phones are banned on board, and they must remain __________ until the aircraft has landed.
(A) switched on
(B) switch on
(C) switch off
(D) switched off
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統計： A(1), B(13), C(13), D(38), E(0) #666373
統計： A(1), B(13), C(13), D(38), E(0) #666373