问题补充：
单选题_______nottobelateforthemeeting,wearrivedfortyminutes_______therequiredtime,butafter_____seemedhoursofwaiting,wewereinformedthemeetinghadbeencanceled.A.So as; ahead of; whatB.In order; ahead of; whatC.So as; in advance of; itD.In order; ahead of; it
答案：
B解析考查短语及名词性从句。so as to与in order to 都是为了做某事，前者只能放在句中，后者句首、句中都可以；ahead of time提前，第三个空考查名词性从句，从句中缺少主语故用what，所以
