Because of the Mid-autumn Day happening to _________, we have just enjoyed a longer          National Day vacation than ever before, but it is estimated that it will be 38 years __________       we can experience such a coincidence again.

A．make up, when

B．Come across, that

C．pick up, since

D．come along, before

技术学习的过程是技术采用者的知识和技术能力不断累积的过程。