SAT的一个句子分析.

Despite the efforts of the pubilcity subcommittee,hardly anyone attended the workshop that had been planned so painstakingly.
试翻译：虽然经过宣传组的努力,还是几乎没人参加之前煞费苦心筹划的研讨会.
这里,that had been planned so painstakingly 是定语从句,它的谓语动词表示的动作 plan 发生在主句谓语动词 attended 之前,所以用了 had been planned （过去完成时,表示时间“过去的过去”）