49. What is NOT mentioned as a possible solution to the problem?
(A) Use headphones.
(B) Turn the volume down.
(C) Install sound-proof walls.
(D) Avoid listening to music at late hours.

答案：登入後查看
統計： A(41), B(28), C(319), D(36), E(0) #2167800

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#4254691
（C）安裝隔音壁。
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私人筆記#5676585
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