--- Can we leave the classroom now?

-- No, you ______. You ______ to leave until the bell rings.

A．mustn’t, are allowed

B．don’t have to, are supposed

C．needn’t, aren’t allowed

D．can’t, aren’t supposed

有关Wegener肉芽肿病的描述，正确的是（）

A.常累及泌尿、生殖器官、肺组织，很少累及皮肤和关节

B.基本病变是肺间质肺泡水肿

C.常合并肺癌

D.是系统性坏死性血管炎，常累及肺和上呼吸道

E.基本病变是嗜酸性肉芽肿形成