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

It can be inferred that A. most movie theaters had a pianist B. sound-effects machines were not common because they were expensive C. orchestras couldn't synchronize s

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It can be inferred that

most movie theaters had a pianist

sound-effects machines were not common because they were expensive

orchestras couldn't synchronize sound with the pictures

gramophones were developed about the same time as moving pictures.

Giải thích

Chọn D