They felt so _____ that they _____ go to  bed early.[ ]

A. excited; could

B. excitedly; could

C. excited; couldn't

D. excitedly; couldn't  

为保证断路器主触头闭合瞬间δ=0°，准同期并列装置应（）时间发出合闸脉冲信号。

A.滞后

B.越前

C.同时

D.任意