Brasses are musical instruments that produce tones______the mouthpiece.

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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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托福（TOEFL）

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