Bob!Would you please ask all your classmates___ before Miss

Bob!Would you please ask all your classmates___ before Miss Li_
---Bob!Would you please ask all your classmates_______ before Miss Li_______ back?
---OK.I’ll take them right away.
A.not to leave; will come
B.not to leave; comes
C.don’t leave; comes
D.don’t leave;will come
为什么don’t leave和will come