B
It is necessary/essential/important that+(should)+动词原形,于是排除A;从语意上理解,问题是他拒绝去.refused to 后面省略了Miami,是可以的,这句话其实不缺成分,所以是一个表语从句.
B
It is necessary/essential/important that+(should)+动词原形,于是排除A;从语意上理解,问题是他拒绝去.refused to 后面省略了Miami,是可以的,这句话其实不缺成分,所以是一个表语从句.