会计凭证是会计人员根据审核无误的原始凭证，按照经济业务的内容加以归类，并据以确定会计分录后填制的，是登记账簿的直接依据。 ( )

.When we reached the station, the train had still not arrived; so we ______.

a. needed not to hurry         b. needn’t have hurried   

c. need not to have hurried     d. didn’t need to hurry