题目内容：

This is the very plan for the summer holiday ___ will be suggested by him
a which b that c / d it
选B

优质解答

B
当有the very,the only,the next 或最高级,序数词修饰先行词时,定语从句引导词只能用that
定语从句中的语法条条.
建议楼主可以系统地看下定语从句的语法细节