Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có lời giải chi tiết (Đề 2)

According to the passage, sound-on-film guaranteed synchronization because the recording was A. made during the film of the picture. B. read by an optical sensor C. inserted beside the image

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According to the passage, sound-on-film guaranteed synchronization because the recording was

made during the film of the picture.

read by an optical sensor

inserted beside the image on the film

marked on the gramophone

Giải thích

Chọn C