----Are you a volleyball player in your school?

----Yes. I_____the team a year ago and I ____on the team for a year.

A．have joined, have been

B．was joined ,am

C．joined，was

D．joined, have been

胎头跨耻征阳性的初产妇临产后，经检查不可能出现的项目是（）。

A．子宫收缩力异常

B．胎位异常

C．胎膜早破

D．病理性缩复环

E．胎头衔接