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【題目】 to smart phones just before bed, as a research says recently, can lead to poor night's sleep.
A.Being exposed
B.Exposed
C.Having exposed
D.To expose

【答案】A
【解析】句意：據最近的一次調查報道，睡前接觸智能手機會導致晚上睡不好。人是被暴露在手機輻射下的，應用被動語態(tài)。Being exposed to…在句中作主語，應用動名詞。故選A項。

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