．— I ____ to your birthday party last Sunday.

— Unfortunately, you were out on business.

A．had come

B．came

C．would come

D．would have come

螺杆泵的转子和定子作相对转动时，封闭腔室能作（），使其中的液体从一端移向另一端，实现机械能和液体能的相互转化，从而实现举升液体的作用。

A、纵向移动

B、横向移动

C、轴向移动

D、上下移动