You can go out _____ you promise to be back before 11 o’clock.

1. A.
   so that
2. B.
   as far as
3. C.
   so long as
4. D.
   in case

You can go out _____ you promise to be back before 11 o’clock.

A. so that 　 B. as far as　 C. so long as 　 D. in case

You can go out, _________ you promise to be back before 11 o'clock.

You can go out, _________you promise to be back before 11 o'clock.

You can go out, _________you promise to be back before 11 o'clock.

A．as far as           B．so far as           C．when             D．as long as