【題目】More of us are using headphones in noisier environments, ______ we may turn up the volume to potentially dangerous levels.

A. when B. while C. before D. where

【答案】D

【解析】

考查定語(yǔ)從句。句意：我們中越來(lái)越多的人在噪音更大的環(huán)境中使用耳機(jī)，這樣我們可能會(huì)把音量調(diào)到潛在危險(xiǎn)的水平。此處environments做先行詞，在后面的非限制性定語(yǔ)從句中作地點(diǎn)狀語(yǔ)，故答案為D。

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