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
题目
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