Never before________ seen a girl who can swim as fast as Ye Shiwen.

A．had we

B．we had

C．have we

D．we have

排便时，间歇性带血，并有肿物脱出肛门外，排便完自行还纳，诊断为（）

A.外瘘

B.Ⅱ度内痔

C.直肠息肉

D.Ⅲ度内痔

E.直肠黏膜部分脱垂