下列等式成立的是( )
A:﹣(3m﹣1)=﹣3m﹣1
B:3x﹣(2x﹣1)=3x﹣2x+1
C:5(a﹣b)=5a﹣b
D:7﹣(x+4y)=7﹣x+4y
—I'm sorry I stepped outside for a smoke.I was very tired.
—There's no________for this while you are on duty.