—It’s thirty years since we last met.

—But I still remember the story, believe it or not, _______ we got lost on a rainy night.

A．which

B．that

C．what

D．when

（）主要用于高压，大流量和流量需要调节的液压传动系统。

A.齿轮液压泵

B.叶片液压泵

C.柱塞式液压泵

D.离心液压泵