— 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

KYN28中置式开关柜，是铠装（）交流金属封闭式开关柜

A.固定式

B.移开式

C.分体式

D.环网式