Isn't it time you got down to        the papers?

A．mark

B．be marked

C．being marked

D．marking

下列哪种疾病又称为白塞综合征（）

A．重症多形渗出性红斑

B．口眼生殖器三联综合征

C．韦格内肉芽肿

D．腺周口疮

E．良性黏膜类天疱疮