_______not to be late for the meeting, we arrived forty minutes _______ the required time, but after _____seemed hours of waiting, we were informed the meeting had been canceled.A.So as; ahead of; whatB.In order; ahead of; whatC.So as; in advance of; itD.In order; ahead of; it
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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