______ before bed, cellphones can result in a restless night.

A. To use B. Using C. Used D. Having used

 

C

【解析】

試題分析：考查非謂語動(dòng)詞。句意：睡前使用手機(jī)，會(huì)導(dǎo)致睡眠質(zhì)量下降。Cellphones與use是動(dòng)賓關(guān)系，即使用手機(jī)，應(yīng)該用過去分詞表被動(dòng)，排除A、B、D，本句可改寫為：If cellphones are used before bed, they can result in a restless night.，故選C。

考點(diǎn)：考查非謂語動(dòng)詞

 

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