The Mid-autumn Day happening to _________along National Day, 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

椭圆齿轮式流量计是根据被测介质的能量来推动椭圆齿轮旋转，从齿轮旋转排出介质的多少来测量流量的。