After having switched off the mains separator, wait for ___________ before switching it back on.
举一反三
- After having switched off the mains separator, wait for ___________ before switching it back on. A: one minute B: at least one minute C: more than one minute D: no more than one minute
- I'm sure he will be back ______. Just wait a minute. A: long before B: before long C: after long D: long after
- Which ____________ do I press to turn it off? A: switched B: switch C: switches D: switching
- --- The light in the office is still on. A: turn it off B: having turned it off C: to turn it off D: turning it off
- --- Look! The lights in the classroom are still on. __________ A: turning them off B: turn them off C: to turn them off D: having turned them off