Not once ________ to Michael that he could one day become a top student in his class.

A．occurred it

B．it did occur

C．it occurred

D．did it occur

少数引起局部组织的缺血性坏死，在眼造成巩膜炎属于（）。

A.心包炎

B.类风湿结节

C.类风湿性血管炎

D.神经系统病变

E.肺间质病变和结节样改变