If your phone rings or buzzes, don’t take it ________ it’s an emergency.
A: unless
B: if
C: until
A: unless
B: if
C: until
举一反三
- Don’t call me unless it’s a real emergency. This is a __________ sentence.( ) A: compound B: compound-complex C: complex D: simple
- I don't want to hear your opinion — unless it's __________ of course.
- It’s quite cold outside. Please（）your coat. A: don’t take off B: take off C: don’t put on
- Don't smoke until the plane _____ off. A: takes B: take C: will take
- -Your phone number again? I____quite catch it.-It's 9568442. A: didn't B: couldn't C: don't D: can't