Children who are not active or diet is high in fat will gain weight quickly.
A. what
B. whose
C. which
D. that
网友回答
A. what
(答案→)B. whose
C. which
D. that
解析：B 考察定语从句。分析句子结构可知，先行词Children和diet之间构成所属构成，因此使用whose做定语，what不能引导定语从句；which和that在定语从句做主语，宾语，表语较多。故B正确。