1. It is cold in the room. They ______ have turned off the heating.
举一反三
- It is cold in the room. They ________ the heating. A: must have turned off B: must turn off C: can’t have turned off D: may turn off
- It is cold in the room. They ____ have turned off the heating. A: must B: can C: mustn’t D: can’t
- ___ the heating off? It's really cold in here. A: Do they turn B: Have they turned
- It was very dark. So he _______ the lights as soon as he entered the room. A: turned on B: turned off C: turns on D: turns off
- All the lights before we left the office. A: has been turned off B: have turned off C: had been turned off D: had turned off