单选题The sound-on-film system guaranteed synchronization because the recording was ______.A made during the filming of the pictureB edited by an optical sensorC inserted on the filmD marked on the gramophone

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单选题
The sound-on-film system guaranteed synchronization because the recording was ______.
A

made during the filming of the picture

B

edited by an optical sensor

C

inserted on the film

D

marked on the gramophone

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