— I'd love to go to the party with you tonight.

— Oh, I'm sorry, there________be a party because of the coming exam.[ ]

A. mustn't  

B. needn't

C. can't  

D. oughtn't

肺间质性弥漫性纤维化是下列哪种尘肺的基本病理改变

A．棉尘症
B．农民肺
C．石棉肺
D．结节型矽肺
E．煤工尘肺