Brasses are musical instruments that produce tones______the mouthpiece.A、lips vi

游客2024-01-02 42

问题 Brasses are musical instruments that produce tones______the mouthpiece.

选项 A、lips vibrating
B、lips are vibrating
C、lips vibrate
D、when lips vibrate

答案 D

解析 When lips vibrate is a subordinator + subject + verb structure, which forms the beginning of an adverb clause.

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