关于产时子宫颈扩大，下列哪项是错误的

A．是子宫收缩将子宫下段向上牵拉的结果

B．前羊膜囊的作用

C．初产妇宫颈管消失与宫口开大同时进行

D．破膜后胎头直接压迫子宫颈

E．无头盆不称时，宫颈口扩张的快慢，对产程的长短起决定性作用

It's seven thirty.  I_________ go to school.[ ]

A. have got      

B. have got to    

C. got to        

D. had got to