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【题目】Teenagers get less and less sleep, them at a higher risk of physical and mental health problems.

A. putting B. put

C. to put D. being put

【答案】A

【解析】考查非谓语动词。句意:青少年的睡眠越来越少,使他们面临更大的身体和心理健康问题。句中Teenagers get less and less sleep和动词put是主动关系,此处作结果状语用现在分词,故选A.

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