I would appreciate ____  if you could give me a hand.

A．that

B．/

C．one

D．it

角膜带状变性的常见病因中，错误的是______

A．眼部慢性炎症
B．高钙血症
C．原发性遗传因素
D．肾衰竭
E．匐行性角膜溃疡