You can go out ______ you promise to be back before 10 o'clock.
举一反三
- You can' t ______your promise; all the people here are depending on you. A: back off B: back up C: back on to D: back out of
- You can go where you like ___( )__ you get back before it is dark. A: as long as B: all at once C: in advance D: get to
- _____you have finished your homework, you can go out and play. A: Until B: Unless C: If D: Before
- You can’t go back______ your promise, for we are depending on you now.
- - Could I go to the movie this weekend, Dad?- Yes, you ____. But you have to come back before 9. A: shall B: must C: need D: can