The number of people invited __________ fifty, but a number of them __________ absent for different reasons

A．were ; was

B．was ; was

C．was ; were

D．were ; were

CT显示一侧上颌窦窦腔密度增高，伴不规则钙化影及窦壁骨质缺损，最可能的诊断是（）。

A.上颌窦癌

B.鼻内翻性 * * 状瘤

C.霉菌性鼻窦炎

D.黏液囊肿

E.上颌窦息肉