Research shows that teenagers talk about their day with family members at the dinner tabl

Research shows that teenagers talk about their day with family members at the dinner table are less likely to engage in high-risk behavior.
A. what
B. who
C. whom
D. \

A. what(答案→)B. whoC. whomD. \解析：考查定语从句。本句中先行词为the teenagers，在定语从句中做主语，不能省略。What不能引导定语从句；whom在句中通常做宾语。句意：研究说明那些在吃饭的时候和家人谈论很多学校事情的年轻人不太可能染上危险的行为。故B正确。

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