【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
在线课程【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.