Helen always keeps her smartphone switched off ________ she’s expecting a call. ( ).
A: once
B: since
C: unless
D: when
A: once
B: since
C: unless
D: when
举一反三
- Helen looked tired ______ she stayed up all night preparing for today’s exam. A: because B: if C: unless D: when
- ---"Shall Mary come and play computer games?"--- "No, _______ she has finished her homework." A: when B: since C: unless D: as soon as
- Despite of the busy schedule, she keeps __________ with her grandparents once or twice every month.
- What should you do when you are expecting an urgent call while you will be in an important meeting? A: Inform your co-workers that you are expecting an urgent call and that you will need to excuse yourself briefly to answer it. B: Take the call during the meeting, apologize later. C: Take the call anyway, your co-workers will understand that it must have been important. D: Keep the phone switched off, calls can wait.
- Xiao Fei always keeps his phone switched on.