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,