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【题目】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】

考查定语从句。句意:我们中越来越多的人在噪音更大的环境中使用耳机,这样我们可能会把音量调到潜在危险的水平。此处environments做先行词,在后面的非限制性定语从句中作地点状语,故答案为D。

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