单选题
It was recommended that they__for the doctor.
Ahas waited
Bwaited
Cshould wait
Dshould have waited
正确答案
答案解析
在“It is+表示提议、要求、命令等含义的动词过去分词+that分句”这一结构中,从句谓语动词用“动词原形”或“should+动词原形”表示虚拟语气。