求教道关于when的题，新东方蓝皮书

brucelee8856

section 12, 4
 The Olmpic Games helped to keep peace among the pugnacious states of the Greek world in that a sacred truce was proclaimed during the festival's month.
答案是：world when they proclaimed a sacred truce for the festival month
我选的A，A 我觉得也没错啊，因果关系，莫非是因为during要用现在完成时的关系？ 我记得prep上说，when 不是只能加在动作后面或者时间后面而且不能随便乱加，求教A错在哪里，还有when的用法，

brucelee8856

求助啊求助

amy虫子

A 的in that 太正式了，festival's month 也不对